Refactor: migrate POSIX scaffolding to CBOR and JSONC

Backend/go.mod

@@ -3,11 +3,13 @@ module moku-backend
 go 1.25.7
 
 require (
+	github.com/fxamacker/cbor/v2 v2.9.0
 	github.com/go-chi/chi/v5 v5.3.0
 	github.com/google/uuid v1.6.0
 	github.com/jackc/pgx/v5 v5.10.0
 	github.com/pressly/goose/v3 v3.27.1
 	github.com/redis/go-redis/v9 v9.20.1
+	github.com/tailscale/hujson v0.0.0-20250605163823-992244df8c5a
 )
 
 require (
@@ -17,6 +19,7 @@ require (
 	github.com/jackc/puddle/v2 v2.2.2 // indirect
 	github.com/mfridman/interpolate v0.0.2 // indirect
 	github.com/sethvargo/go-retry v0.3.0 // indirect
+	github.com/x448/float16 v0.8.4 // indirect
 	go.uber.org/atomic v1.11.0 // indirect
 	go.uber.org/multierr v1.11.0 // indirect
 	golang.org/x/sync v0.20.0 // indirect

Backend/go.sum

@@ -9,8 +9,12 @@ github.com/davecgh/go-spew v1.1.1 h1:vj9j/u1bqnvCEfJOwUhtlOARqs3+rkHYY13jYWTU97c
 github.com/davecgh/go-spew v1.1.1/go.mod h1:J7Y8YcW2NihsgmVo/mv3lAwl/skON4iLHjSsI+c5H38=
 github.com/dustin/go-humanize v1.0.1 h1:GzkhY7T5VNhEkwH0PVJgjz+fX1rhBrR7pRT3mDkpeCY=
 github.com/dustin/go-humanize v1.0.1/go.mod h1:Mu1zIs6XwVuF/gI1OepvI0qD18qycQx+mFykh5fBlto=
+github.com/fxamacker/cbor/v2 v2.9.0 h1:NpKPmjDBgUfBms6tr6JZkTHtfFGcMKsw3eGcmD/sapM=
+github.com/fxamacker/cbor/v2 v2.9.0/go.mod h1:vM4b+DJCtHn+zz7h3FFp/hDAI9WNWCsZj23V5ytsSxQ=
 github.com/go-chi/chi/v5 v5.3.0 h1:halUjDxhshgXHMrao5bB8eNBXo/rnzwr8m5m36glehM=
 github.com/go-chi/chi/v5 v5.3.0/go.mod h1:R+tYY2hNuVUUjxoPtqUdgBqevM9s9njzkTLutVsOCto=
+github.com/google/go-cmp v0.5.8 h1:e6P7q2lk1O+qJJb4BtCQXlK8vWEO8V1ZeuEdJNOqZyg=
+github.com/google/go-cmp v0.5.8/go.mod h1:17dUlkBOakJ0+DkrSSNjCkIjxS6bF9zb3elmeNGIjoY=
 github.com/google/uuid v1.6.0 h1:NIvaJDMOsjHA8n1jAhLSgzrAzy1Hgr+hNrb57e+94F0=
 github.com/google/uuid v1.6.0/go.mod h1:TIyPZe4MgqvfeYDBFedMoGGpEw/LqOeaOT+nhxU+yHo=
 github.com/jackc/pgpassfile v1.0.0 h1:/6Hmqy13Ss2zCq62VdNG8tM1wchn8zjSGOBJ6icpsIM=
@@ -44,6 +48,10 @@ github.com/stretchr/testify v1.3.0/go.mod h1:M5WIy9Dh21IEIfnGCwXGc5bZfKNJtfHm1UV
 github.com/stretchr/testify v1.7.0/go.mod h1:6Fq8oRcR53rry900zMqJjRRixrwX3KX962/h/Wwjteg=
 github.com/stretchr/testify v1.11.1 h1:7s2iGBzp5EwR7/aIZr8ao5+dra3wiQyKjjFuvgVKu7U=
 github.com/stretchr/testify v1.11.1/go.mod h1:wZwfW3scLgRK+23gO65QZefKpKQRnfz6sD981Nm4B6U=
+github.com/tailscale/hujson v0.0.0-20250605163823-992244df8c5a h1:a6TNDN9CgG+cYjaeN8l2mc4kSz2iMiCDQxPEyltUV/I=
+github.com/tailscale/hujson v0.0.0-20250605163823-992244df8c5a/go.mod h1:EbW0wDK/qEUYI0A5bqq0C2kF8JTQwWONmGDBbzsxxHo=
+github.com/x448/float16 v0.8.4 h1:qLwI1I70+NjRFUR3zs1JPUCgaCXSh3SW62uAKT1mSBM=
+github.com/x448/float16 v0.8.4/go.mod h1:14CWIYCyZA/cWjXOioeEpHeN/83MdbZDRQHoFcYsOfg=
 github.com/zeebo/xxh3 v1.1.0 h1:s7DLGDK45Dyfg7++yxI0khrfwq9661w9EN78eP/UZVs=
 github.com/zeebo/xxh3 v1.1.0/go.mod h1:IisAie1LELR4xhVinxWS5+zf1lA4p0MW4T+w+W07F5s=
 go.uber.org/atomic v1.11.0 h1:ZvwS0R+56ePWxUNi+Atn9dWONBPp/AUETXlHW0DxSjE=

Backend/internal/bootstrap/project_disk_bootstrap.go

@@ -26,7 +26,7 @@ func (service *Service) ensureBootstrapPOSIXSkeleton(
 		return fmt.Errorf("create POSIX root: %w", err)
 	}
 
-	if err := writeJSONFile(filepath.Join(rootPath, "settings.json"), map[string]any{
+	if err := writeCBORFile(filepath.Join(rootPath, posixSettingsFileName), map[string]any{
 		"installation": map[string]any{
 			"id":             installation.ID,
 			"name":           installation.Name,
@@ -42,17 +42,17 @@ func (service *Service) ensureBootstrapPOSIXSkeleton(
 			"slug": organization.Slug,
 		},
 	}); err != nil {
-		return fmt.Errorf("write tenant settings.json: %w", err)
+		return fmt.Errorf("write tenant %s: %w", posixSettingsFileName, err)
 	}
 
-	if err := writeJSONFile(filepath.Join(rootPath, "layout.json"), map[string]any{
+	if err := writeCBORFile(filepath.Join(rootPath, posixLayoutFileName), map[string]any{
 		"version": 1,
 		"type":    "tenant-layout",
 		"home": map[string]any{
 			"defaultProjectSlug": project.Slug,
 		},
 	}); err != nil {
-		return fmt.Errorf("write tenant layout.json: %w", err)
+		return fmt.Errorf("write tenant %s: %w", posixLayoutFileName, err)
 	}
 
 	if err := os.MkdirAll(filepath.Join(rootPath, "catalog", "packs"), 0o755); err != nil {
@@ -63,6 +63,67 @@ func (service *Service) ensureBootstrapPOSIXSkeleton(
 		return fmt.Errorf("create catalog standalone root: %w", err)
 	}
 
+	corePackPath := filepath.Join(rootPath, "catalog", "packs", "pack-core")
+	corePackEntriesPath := filepath.Join(corePackPath, "entries")
+	coreAppEntryPath := filepath.Join(corePackEntriesPath, "app-shell")
+	standaloneAppPath := filepath.Join(rootPath, "catalog", "standalone", "app-shell")
+
+	for _, dirPath := range []string{corePackPath, corePackEntriesPath, coreAppEntryPath, standaloneAppPath} {
+		if err := os.MkdirAll(dirPath, 0o755); err != nil {
+			return fmt.Errorf("create catalog directory %s: %w", dirPath, err)
+		}
+	}
+
+	if err := writeJSONCFile(filepath.Join(corePackPath, posixManifestFileName), map[string]any{
+		"id":          "pack-core",
+		"slug":        "core",
+		"type":        "pack",
+		"name":        "Core Pack",
+		"version":     "0.1.0",
+		"description": "First-party shared package of starter Moku surfaces.",
+		"entries": []map[string]any{{
+			"slug": "app-shell",
+			"path": "entries/app-shell",
+		}},
+		"capabilities": []string{"first-party", "bootstrap", "catalog-pack"},
+	}); err != nil {
+		return fmt.Errorf("write catalog pack %s: %w", posixManifestFileName, err)
+	}
+
+	if err := writeJSONCFile(filepath.Join(coreAppEntryPath, posixManifestFileName), map[string]any{
+		"id":          "app-shell",
+		"slug":        "app-shell",
+		"type":        "app",
+		"name":        "App Shell",
+		"version":     "0.1.0",
+		"description": "Primary shell surface for navigating the installation.",
+		"source":      "pack-core",
+		"runtime": map[string]any{
+			"kind": "route",
+			"path": "/v1/app-shell",
+		},
+		"capabilities": []string{"shell", "navigation", "workspace"},
+	}); err != nil {
+		return fmt.Errorf("write catalog entry %s: %w", posixManifestFileName, err)
+	}
+
+	if err := writeJSONCFile(filepath.Join(standaloneAppPath, posixManifestFileName), map[string]any{
+		"id":          "app-shell",
+		"slug":        "app-shell",
+		"type":        "app",
+		"name":        "App Shell",
+		"version":     "0.1.0",
+		"description": "Standalone registration for the primary shell surface.",
+		"source":      "standalone",
+		"runtime": map[string]any{
+			"kind": "route",
+			"path": "/v1/app-shell",
+		},
+		"capabilities": []string{"shell", "navigation", "standalone"},
+	}); err != nil {
+		return fmt.Errorf("write standalone entry %s: %w", posixManifestFileName, err)
+	}
+
 	departmentPath := filepath.Join(rootPath, "departments", slugDir("department", department.Slug))
 	teamPath := filepath.Join(departmentPath, "teams", slugDir("team", team.Slug))
 	projectPath := filepath.Join(rootPath, "projects", slugDir("project", project.Slug))
@@ -89,107 +150,107 @@ func (service *Service) ensureBootstrapPOSIXSkeleton(
 		}
 	}
 
-	if err := writeJSONFile(filepath.Join(departmentPath, "settings.json"), map[string]any{
+	if err := writeCBORFile(filepath.Join(departmentPath, posixSettingsFileName), map[string]any{
 		"id":   department.ID,
 		"name": department.Name,
 		"slug": department.Slug,
 		"type": "department",
 	}); err != nil {
-		return fmt.Errorf("write department settings.json: %w", err)
+		return fmt.Errorf("write department %s: %w", posixSettingsFileName, err)
 	}
 
-	if err := writeJSONFile(filepath.Join(departmentPath, "users.json"), map[string]any{
+	if err := writeCBORFile(filepath.Join(departmentPath, posixUsersFileName), map[string]any{
 		"owners": []map[string]string{{
 			"id":          admin.ID,
 			"email":       admin.Email,
 			"displayName": admin.DisplayName,
 		}},
 	}); err != nil {
-		return fmt.Errorf("write department users.json: %w", err)
+		return fmt.Errorf("write department %s: %w", posixUsersFileName, err)
 	}
 
-	if err := writeJSONFile(filepath.Join(teamPath, "settings.json"), map[string]any{
+	if err := writeCBORFile(filepath.Join(teamPath, posixSettingsFileName), map[string]any{
 		"id":   team.ID,
 		"name": team.Name,
 		"slug": team.Slug,
 		"type": "team",
 	}); err != nil {
-		return fmt.Errorf("write team settings.json: %w", err)
+		return fmt.Errorf("write team %s: %w", posixSettingsFileName, err)
 	}
 
-	if err := writeJSONFile(filepath.Join(teamPath, "users.json"), map[string]any{
+	if err := writeCBORFile(filepath.Join(teamPath, posixUsersFileName), map[string]any{
 		"owners": []map[string]string{{
 			"id":          admin.ID,
 			"email":       admin.Email,
 			"displayName": admin.DisplayName,
 		}},
 	}); err != nil {
-		return fmt.Errorf("write team users.json: %w", err)
+		return fmt.Errorf("write team %s: %w", posixUsersFileName, err)
 	}
 
-	if err := writeJSONFile(filepath.Join(projectPath, "settings.json"), map[string]any{
+	if err := writeCBORFile(filepath.Join(projectPath, posixSettingsFileName), map[string]any{
 		"id":   project.ID,
 		"name": project.Name,
 		"slug": project.Slug,
 		"type": "project",
 	}); err != nil {
-		return fmt.Errorf("write project settings.json: %w", err)
+		return fmt.Errorf("write project %s: %w", posixSettingsFileName, err)
 	}
 
-	if err := writeJSONFile(filepath.Join(projectPath, "home.json"), map[string]any{
+	if err := writeCBORFile(filepath.Join(projectPath, posixHomeFileName), map[string]any{
 		"type":  "project-home",
 		"title": project.Name,
 	}); err != nil {
-		return fmt.Errorf("write project home.json: %w", err)
+		return fmt.Errorf("write project %s: %w", posixHomeFileName, err)
 	}
 
-	if err := writeJSONFile(filepath.Join(projectPath, "acl.json"), map[string]any{
+	if err := writeCBORFile(filepath.Join(projectPath, posixACLFileName), map[string]any{
 		"version":  1,
 		"inherits": true,
 		"rules":    []any{},
 	}); err != nil {
-		return fmt.Errorf("write project acl.json: %w", err)
+		return fmt.Errorf("write project %s: %w", posixACLFileName, err)
 	}
 
-	if err := writeJSONFile(filepath.Join(usersPath, "settings.json"), map[string]any{
+	if err := writeCBORFile(filepath.Join(usersPath, posixSettingsFileName), map[string]any{
 		"primaryAdminId": admin.ID,
 	}); err != nil {
-		return fmt.Errorf("write users settings.json: %w", err)
+		return fmt.Errorf("write users %s: %w", posixSettingsFileName, err)
 	}
 
-	if err := writeJSONFile(filepath.Join(usersPath, "data.json"), map[string]any{
+	if err := writeCBORFile(filepath.Join(usersPath, posixDataFileName), map[string]any{
 		"admins": []map[string]string{{
 			"id":          admin.ID,
 			"email":       admin.Email,
 			"displayName": admin.DisplayName,
 		}},
 	}); err != nil {
-		return fmt.Errorf("write users data.json: %w", err)
+		return fmt.Errorf("write users %s: %w", posixDataFileName, err)
 	}
 
-	if err := writeJSONFile(filepath.Join(personalHomePath, "settings.json"), map[string]any{
+	if err := writeCBORFile(filepath.Join(personalHomePath, posixSettingsFileName), map[string]any{
 		"type": "personal",
 		"name": personalName,
 		"slug": personalSlug,
 	}); err != nil {
-		return fmt.Errorf("write personal settings.json: %w", err)
+		return fmt.Errorf("write personal %s: %w", posixSettingsFileName, err)
 	}
 
-	if err := writeJSONFile(filepath.Join(personalHomePath, "layout.json"), map[string]any{
+	if err := writeCBORFile(filepath.Join(personalHomePath, posixLayoutFileName), map[string]any{
 		"version": 1,
 		"type":    "personal-layout",
 		"home": map[string]any{
 			"defaultProjectSlug": project.Slug,
 		},
 	}); err != nil {
-		return fmt.Errorf("write personal layout.json: %w", err)
+		return fmt.Errorf("write personal %s: %w", posixLayoutFileName, err)
 	}
 
-	if err := writeJSONFile(filepath.Join(personalHomePath, "home.json"), map[string]any{
+	if err := writeCBORFile(filepath.Join(personalHomePath, posixHomeFileName), map[string]any{
 		"type":  "personal-home",
 		"title": personalHomeTitle(personalName),
 	}); err != nil {
-		return fmt.Errorf("write personal home.json: %w", err)
+		return fmt.Errorf("write personal %s: %w", posixHomeFileName, err)
 	}
 
 	return nil

Backend/internal/bootstrap/project_disk_folders.go

@@ -57,11 +57,11 @@ func (service *Service) createProjectFolderOnDisk(projectSlug, parentFolderID, n
 		return "", "", fmt.Errorf("create project hierarchy folder: %w", err)
 	}
 	folderID := uuid.NewString()
-	if err := writeJSONFile(filepath.Join(folderDir, "folder.json"), map[string]any{"id": folderID, "name": trimmedName, "slug": folderSlug, "type": "folder"}); err != nil {
+	if err := writeCBORFile(filepath.Join(folderDir, posixFolderFileName), map[string]any{"id": folderID, "name": trimmedName, "slug": folderSlug, "type": "folder"}); err != nil {
-		return "", "", fmt.Errorf("write project folder.json: %w", err)
+		return "", "", fmt.Errorf("write project %s: %w", posixFolderFileName, err)
 	}
-	if err := writeJSONFile(filepath.Join(folderDir, "acl.json"), map[string]any{"version": 1, "inherits": true, "rules": []any{}}); err != nil {
+	if err := writeCBORFile(filepath.Join(folderDir, posixACLFileName), map[string]any{"version": 1, "inherits": true, "rules": []any{}}); err != nil {
-		return "", "", fmt.Errorf("write project acl.json: %w", err)
+		return "", "", fmt.Errorf("write project %s: %w", posixACLFileName, err)
 	}
 	return filepath.ToSlash(filepath.Join(containerProjectionPath, folderName)), folderSlug, nil
 }
@@ -150,13 +150,13 @@ func (service *Service) renameProjectFolderOnDisk(projectSlug, folderID, name st
 			return "", "", fmt.Errorf("rename project folder: %w", err)
 		}
 	}
-	folderPayload := readJSONFileMap(filepath.Join(destinationDir, "folder.json"))
+	folderPayload := readStructuredFileMap(filepath.Join(destinationDir, posixFolderFileName))
 	folderMetadataID, _ := folderPayload["id"].(string)
 	if strings.TrimSpace(folderMetadataID) == "" {
 		folderMetadataID = uuid.NewString()
 	}
-	if err := writeJSONFile(filepath.Join(destinationDir, "folder.json"), map[string]any{"id": folderMetadataID, "name": trimmedName, "slug": folderSlug, "type": "folder"}); err != nil {
+	if err := writeCBORFile(filepath.Join(destinationDir, posixFolderFileName), map[string]any{"id": folderMetadataID, "name": trimmedName, "slug": folderSlug, "type": "folder"}); err != nil {
-		return "", "", fmt.Errorf("write renamed project folder.json: %w", err)
+		return "", "", fmt.Errorf("write renamed project %s: %w", posixFolderFileName, err)
 	}
 	return folderProjectionPath, renamedProjectionPath, nil
 }
@@ -210,7 +210,7 @@ func (service *Service) moveProjectFolderOnDisk(projectSlug, folderID, parentFol
 	if samePath(currentParentDir, parentDir) {
 		return folderProjectionPath, folderProjectionPath, nil
 	}
-	folderPayload := readJSONFileMap(filepath.Join(folderDir, "folder.json"))
+	folderPayload := readStructuredFileMap(filepath.Join(folderDir, posixFolderFileName))
 	folderMetadataID, _ := folderPayload["id"].(string)
 	if strings.TrimSpace(folderMetadataID) == "" {
 		folderMetadataID = uuid.NewString()
@@ -244,8 +244,8 @@ func (service *Service) moveProjectFolderOnDisk(projectSlug, folderID, parentFol
 	folderPayload["name"] = folderName
 	folderPayload["slug"] = folderSlug
 	folderPayload["type"] = "folder"
-	if err := writeJSONFile(filepath.Join(destinationDir, "folder.json"), folderPayload); err != nil {
+	if err := writeCBORFile(filepath.Join(destinationDir, posixFolderFileName), folderPayload); err != nil {
-		return "", "", fmt.Errorf("write moved project folder.json: %w", err)
+		return "", "", fmt.Errorf("write moved project %s: %w", posixFolderFileName, err)
 	}
 	movedProjectionPath := filepath.ToSlash(filepath.Join(parentChildrenProjectionPath, folderDirName))
 	return folderProjectionPath, movedProjectionPath, nil

Backend/internal/bootstrap/project_disk_helpers.go

@@ -9,6 +9,22 @@ import (
 	"path/filepath"
 	"strings"
 	"unicode"
+
+	"github.com/fxamacker/cbor/v2"
+	"github.com/tailscale/hujson"
+)
+
+const (
+	posixSettingsFileName = "settings.cbor"
+	posixLayoutFileName   = "layout.cbor"
+	posixHomeFileName     = "home.cbor"
+	posixUsersFileName    = "users.cbor"
+	posixACLFileName      = "acl.cbor"
+	posixFolderFileName   = "folder.cbor"
+	posixItemFileName     = "item.cbor"
+	posixDataFileName     = "data.cbor"
+	posixSchemaFileName   = "schema.json"
+	posixManifestFileName = "manifest.jsonc"
 )
 
 func samePath(left, right string) bool {
@@ -125,14 +141,93 @@ func writeJSONFile(path string, payload any) error {
 	return os.WriteFile(path, data, 0o644)
 }
 
-func readJSONFileMap(path string) map[string]any {
+func writeJSONCFile(path string, payload any) error {
+	parentDir := filepath.Dir(path)
+	if err := os.MkdirAll(parentDir, 0o755); err != nil {
+		return err
+	}
+	data, err := json.MarshalIndent(payload, "", "  ")
+	if err != nil {
+		return err
+	}
+	content := append([]byte("// This file is JSONC. Comments and trailing commas are allowed.\n"), data...)
+	content = append(content, '\n')
+	return os.WriteFile(path, content, 0o644)
+}
+
+func writeCBORFile(path string, payload any) error {
+	parentDir := filepath.Dir(path)
+	if err := os.MkdirAll(parentDir, 0o755); err != nil {
+		return err
+	}
+	data, err := cbor.Marshal(payload)
+	if err != nil {
+		return err
+	}
+	return os.WriteFile(path, data, 0o644)
+}
+
+func readStructuredFileMap(path string) map[string]any {
 	data, err := os.ReadFile(path)
 	if err != nil {
 		return map[string]any{}
 	}
-	var payload map[string]any
+	var payload any
-	if err := json.Unmarshal(data, &payload); err != nil || payload == nil {
+	switch strings.ToLower(filepath.Ext(path)) {
+	case ".cbor":
+		err = cbor.Unmarshal(data, &payload)
+	case ".json":
+		err = json.Unmarshal(data, &payload)
+	case ".jsonc":
+		payload, err = decodeJSONCToAny(data)
+	default:
 		return map[string]any{}
 	}
-	return payload
+	if err != nil || payload == nil {
+		return map[string]any{}
+	}
+	normalized, ok := normalizeStructuredValue(payload).(map[string]any)
+	if !ok || normalized == nil {
+		return map[string]any{}
+	}
+	return normalized
+}
+
+func decodeJSONCToAny(data []byte) (any, error) {
+	ast, err := hujson.Parse(data)
+	if err != nil {
+		return nil, err
+	}
+	ast.Standardize()
+	standardized := ast.Pack()
+	var payload any
+	if err := json.Unmarshal(standardized, &payload); err != nil {
+		return nil, err
+	}
+	return payload, nil
+}
+
+func normalizeStructuredValue(value any) any {
+	switch typed := value.(type) {
+	case map[string]any:
+		normalized := make(map[string]any, len(typed))
+		for key, child := range typed {
+			normalized[key] = normalizeStructuredValue(child)
+		}
+		return normalized
+	case map[any]any:
+		normalized := make(map[string]any, len(typed))
+		for key, child := range typed {
+			normalized[fmt.Sprint(key)] = normalizeStructuredValue(child)
+		}
+		return normalized
+	case []any:
+		normalized := make([]any, len(typed))
+		for index, child := range typed {
+			normalized[index] = normalizeStructuredValue(child)
+		}
+		return normalized
+	default:
+		return value
+	}
 }

Backend/internal/bootstrap/project_disk_items.go

@@ -58,14 +58,14 @@ func (service *Service) createProjectTreeItemOnDisk(projectSlug, parentFolderPat
 		return "", fmt.Errorf("create project item: %w", err)
 	}
 	itemID := uuid.NewString()
-	if err := writeJSONFile(filepath.Join(itemDir, "item.json"), map[string]any{"id": itemID, "name": trimmedName, "slug": itemSlug, "type": canonicalItemType}); err != nil {
+	if err := writeCBORFile(filepath.Join(itemDir, posixItemFileName), map[string]any{"id": itemID, "name": trimmedName, "slug": itemSlug, "type": canonicalItemType}); err != nil {
-		return "", fmt.Errorf("write project item.json: %w", err)
+		return "", fmt.Errorf("write project %s: %w", posixItemFileName, err)
 	}
-	if err := writeJSONFile(filepath.Join(itemDir, "schema.json"), defaultProjectTreeItemSchema(canonicalItemType)); err != nil {
+	if err := writeJSONFile(filepath.Join(itemDir, posixSchemaFileName), defaultProjectTreeItemSchema(canonicalItemType)); err != nil {
-		return "", fmt.Errorf("write project schema.json: %w", err)
+		return "", fmt.Errorf("write project %s: %w", posixSchemaFileName, err)
 	}
-	if err := writeJSONFile(filepath.Join(itemDir, "data.json"), defaultProjectTreeItemData(canonicalItemType, trimmedName)); err != nil {
+	if err := writeCBORFile(filepath.Join(itemDir, posixDataFileName), defaultProjectTreeItemData(canonicalItemType, trimmedName)); err != nil {
-		return "", fmt.Errorf("write project data.json: %w", err)
+		return "", fmt.Errorf("write project %s: %w", posixDataFileName, err)
 	}
 	return filepath.ToSlash(filepath.Join(containerProjectionPath, itemDirName)), nil
 }
@@ -140,7 +140,7 @@ func (service *Service) moveProjectTreeItemOnDisk(projectSlug, itemPath, parentF
 	}
 	currentParentDir := filepath.Dir(itemDir)
 	currentBase := filepath.Base(itemDir)
-	itemPayload := readJSONFileMap(filepath.Join(itemDir, "item.json"))
+	itemPayload := readStructuredFileMap(filepath.Join(itemDir, posixItemFileName))
 	itemID, _ := itemPayload["id"].(string)
 	if strings.TrimSpace(itemID) == "" {
 		itemID = uuid.NewString()
@@ -182,8 +182,8 @@ func (service *Service) moveProjectTreeItemOnDisk(projectSlug, itemPath, parentF
 	itemPayload["name"] = itemName
 	itemPayload["slug"] = itemSlug
 	itemPayload["type"] = canonicalItemType
-	if err := writeJSONFile(filepath.Join(destinationDir, "item.json"), itemPayload); err != nil {
+	if err := writeCBORFile(filepath.Join(destinationDir, posixItemFileName), itemPayload); err != nil {
-		return "", "", fmt.Errorf("write moved project item.json: %w", err)
+		return "", "", fmt.Errorf("write moved project %s: %w", posixItemFileName, err)
 	}
 	return itemProjectionPath, movedProjectionPath, nil
 }

Backend/internal/bootstrap/project_order.go

@@ -11,18 +11,26 @@ import (
 
 func (service *Service) readProjectFolderOrder(projectSlug, rootProjectionPath string) map[string][]string {
 	settingsPath := service.projectSettingsPath(projectSlug)
-	settingsPayload := readJSONFileMap(settingsPath)
+	settingsPayload := readStructuredFileMap(settingsPath)
 	folderOrderPayload, _ := settingsPayload["folderOrder"].(map[string]any)
-	if folderOrderPayload == nil { return map[string][]string{} }
+	if folderOrderPayload == nil {
+		return map[string][]string{}
+	}
 	scopePayload, _ := folderOrderPayload[projectFolderOrderScope(rootProjectionPath)].(map[string]any)
-	if scopePayload == nil { return map[string][]string{} }
+	if scopePayload == nil {
+		return map[string][]string{}
+	}
 	byParentPayload, _ := scopePayload["byParent"].(map[string]any)
-	if byParentPayload == nil { return map[string][]string{} }
+	if byParentPayload == nil {
+		return map[string][]string{}
+	}
 	order := make(map[string][]string, len(byParentPayload))
 	for key, raw := range byParentPayload {
 		for _, id := range stringSliceValue(raw) {
 			trimmedID := strings.TrimSpace(id)
-			if trimmedID == "" || slicesContains(order[key], trimmedID) { continue }
+			if trimmedID == "" || slicesContains(order[key], trimmedID) {
+				continue
+			}
 			order[key] = append(order[key], trimmedID)
 		}
 	}
@@ -31,37 +39,53 @@ func (service *Service) readProjectFolderOrder(projectSlug, rootProjectionPath s
 
 func (service *Service) writeProjectFolderOrder(projectSlug, rootProjectionPath string, folderOrder map[string][]string) error {
 	settingsPath := service.projectSettingsPath(projectSlug)
-	settingsPayload := readJSONFileMap(settingsPath)
+	settingsPayload := readStructuredFileMap(settingsPath)
-	if settingsPayload == nil { settingsPayload = map[string]any{} }
+	if settingsPayload == nil {
+		settingsPayload = map[string]any{}
+	}
 	folderOrderPayload, _ := settingsPayload["folderOrder"].(map[string]any)
-	if folderOrderPayload == nil { folderOrderPayload = map[string]any{} }
+	if folderOrderPayload == nil {
+		folderOrderPayload = map[string]any{}
+	}
 	scopeKey := projectFolderOrderScope(rootProjectionPath)
 	scopePayload, _ := folderOrderPayload[scopeKey].(map[string]any)
-	if scopePayload == nil { scopePayload = map[string]any{} }
+	if scopePayload == nil {
+		scopePayload = map[string]any{}
+	}
 	byParentPayload := map[string]any{}
 	for key, ids := range folderOrder {
-		if len(ids) == 0 { continue }
+		if len(ids) == 0 {
+			continue
+		}
 		copied := make([]string, 0, len(ids))
 		for _, id := range ids {
 			trimmedID := strings.TrimSpace(id)
-			if trimmedID == "" || slicesContains(copied, trimmedID) { continue }
+			if trimmedID == "" || slicesContains(copied, trimmedID) {
+				continue
+			}
 			copied = append(copied, trimmedID)
 		}
-		if len(copied) > 0 { byParentPayload[key] = copied }
+		if len(copied) > 0 {
+			byParentPayload[key] = copied
+		}
 	}
 	scopePayload["byParent"] = byParentPayload
 	folderOrderPayload[scopeKey] = scopePayload
 	settingsPayload["folderOrder"] = folderOrderPayload
-	if err := writeJSONFile(settingsPath, settingsPayload); err != nil { return fmt.Errorf("write project settings.json: %w", err) }
+	if err := writeCBORFile(settingsPath, settingsPayload); err != nil {
+		return fmt.Errorf("write project %s: %w", posixSettingsFileName, err)
+	}
 	return nil
 }
 
 func (service *Service) projectSettingsPath(projectSlug string) string {
-	return filepath.Join(strings.TrimSpace(service.posixRoot), "projects", slugDir("project", projectSlug), "settings.json")
+	return filepath.Join(strings.TrimSpace(service.posixRoot), "projects", slugDir("project", projectSlug), posixSettingsFileName)
 }
 
 func projectFolderOrderScope(rootProjectionPath string) string {
-	if strings.HasSuffix(rootProjectionPath, "/tree") { return projectFolderOrderTree }
+	if strings.HasSuffix(rootProjectionPath, "/tree") {
+		return projectFolderOrderTree
+	}
 	return projectFolderOrderHierarchy
 }
 
@@ -70,19 +94,33 @@ func applyProjectHierarchyFolderOrdering(folders []ProjectHierarchyFolderRecord,
 }
 
 func applyProjectHierarchyFolderOrderingForParent(folders []ProjectHierarchyFolderRecord, parentID string, folderOrder map[string][]string) []ProjectHierarchyFolderRecord {
-	if len(folders) == 0 { return folders }
+	if len(folders) == 0 {
+		return folders
+	}
 	nextFolders := make([]ProjectHierarchyFolderRecord, len(folders))
 	copy(nextFolders, folders)
-	for index := range nextFolders { nextFolders[index].Children = applyProjectHierarchyFolderOrderingForParent(nextFolders[index].Children, nextFolders[index].ID, folderOrder) }
+	for index := range nextFolders {
+		nextFolders[index].Children = applyProjectHierarchyFolderOrderingForParent(nextFolders[index].Children, nextFolders[index].ID, folderOrder)
+	}
 	orderIDs := folderOrder[projectFolderOrderParentKey(parentID)]
-	if len(orderIDs) == 0 { return nextFolders }
+	if len(orderIDs) == 0 {
+		return nextFolders
+	}
 	rankByID := make(map[string]int, len(orderIDs))
-	for index, id := range orderIDs { if _, exists := rankByID[id]; !exists { rankByID[id] = index } }
+	for index, id := range orderIDs {
+		if _, exists := rankByID[id]; !exists {
+			rankByID[id] = index
+		}
+	}
 	sort.SliceStable(nextFolders, func(left, right int) bool {
 		leftRank, leftOrdered := rankByID[nextFolders[left].ID]
 		rightRank, rightOrdered := rankByID[nextFolders[right].ID]
-		if leftOrdered && rightOrdered { return leftRank < rightRank }
+		if leftOrdered && rightOrdered {
-		if leftOrdered != rightOrdered { return leftOrdered }
+			return leftRank < rightRank
+		}
+		if leftOrdered != rightOrdered {
+			return leftOrdered
+		}
 		return false
 	})
 	return nextFolders
@@ -91,32 +129,47 @@ func applyProjectHierarchyFolderOrderingForParent(folders []ProjectHierarchyFold
 func removeFolderOrder(folderOrder map[string][]string, folderID string) {
 	removeFolderOrderReference(folderOrder, folderID)
 	trimmedFolderID := strings.TrimSpace(folderID)
-	if trimmedFolderID == "" { return }
+	if trimmedFolderID == "" {
+		return
+	}
 	delete(folderOrder, projectFolderOrderParentKey(trimmedFolderID))
 }
 
 func removeFolderOrderReference(folderOrder map[string][]string, folderID string) {
 	trimmedFolderID := strings.TrimSpace(folderID)
-	if trimmedFolderID == "" { return }
+	if trimmedFolderID == "" {
+		return
+	}
 	for key, ids := range folderOrder {
 		nextIDs := ids[:0]
 		for _, id := range ids {
-			if strings.TrimSpace(id) == trimmedFolderID { continue }
+			if strings.TrimSpace(id) == trimmedFolderID {
+				continue
+			}
 			nextIDs = append(nextIDs, id)
 		}
-		if len(nextIDs) == 0 { delete(folderOrder, key); continue }
+		if len(nextIDs) == 0 {
+			delete(folderOrder, key)
+			continue
+		}
 		folderOrder[key] = append([]string(nil), nextIDs...)
 	}
 }
 
 func insertFolderOrder(folderOrder map[string][]string, parentID, folderID string, index int) {
 	trimmedFolderID := strings.TrimSpace(folderID)
-	if trimmedFolderID == "" { return }
+	if trimmedFolderID == "" {
+		return
+	}
 	removeFolderOrderReference(folderOrder, trimmedFolderID)
 	parentKey := projectFolderOrderParentKey(parentID)
 	children := append([]string(nil), folderOrder[parentKey]...)
-	if index < 0 { index = 0 }
+	if index < 0 {
-	if index > len(children) { index = len(children) }
+		index = 0
+	}
+	if index > len(children) {
+		index = len(children)
+	}
 	children = slicesInsert(children, index, trimmedFolderID)
 	folderOrder[parentKey] = children
 }
@@ -126,17 +179,24 @@ func seedFolderOrderParent(folderOrder map[string][]string, folders []ProjectHie
 	trimmedParentID := strings.TrimSpace(parentID)
 	if trimmedParentID != "" {
 		parent, found := findProjectHierarchyFolder(folders, trimmedParentID)
-		if !found { return }
+		if !found {
+			return
+		}
 		children = parent.Children
 	}
 	parentKey := projectFolderOrderParentKey(trimmedParentID)
 	seeded := make([]string, 0, len(children))
 	for _, child := range children {
 		childID := strings.TrimSpace(child.ID)
-		if childID == "" || slicesContains(seeded, childID) { continue }
+		if childID == "" || slicesContains(seeded, childID) {
+			continue
+		}
 		seeded = append(seeded, childID)
 	}
-	if len(seeded) == 0 { delete(folderOrder, parentKey); return }
+	if len(seeded) == 0 {
+		delete(folderOrder, parentKey)
+		return
+	}
 	folderOrder[parentKey] = seeded
 }
 
@@ -146,23 +206,35 @@ func folderOrderChildren(folderOrder map[string][]string, parentID string) []str
 
 func projectFolderOrderParentKey(parentID string) string {
 	trimmedParentID := strings.TrimSpace(parentID)
-	if trimmedParentID == "" { return projectFolderOrderRootKey }
+	if trimmedParentID == "" {
+		return projectFolderOrderRootKey
+	}
 	return trimmedParentID
 }
 
 func stringSliceValue(value any) []string {
 	items, ok := value.([]any)
 	if !ok {
-		if typed, ok := value.([]string); ok { return typed }
+		if typed, ok := value.([]string); ok {
+			return typed
+		}
 		return nil
 	}
 	result := make([]string, 0, len(items))
-	for _, item := range items { if text, ok := item.(string); ok { result = append(result, text) } }
+	for _, item := range items {
+		if text, ok := item.(string); ok {
+			result = append(result, text)
+		}
+	}
 	return result
 }
 
 func slicesContains(values []string, value string) bool {
-	for _, existing := range values { if existing == value { return true } }
+	for _, existing := range values {
+		if existing == value {
+			return true
+		}
+	}
 	return false
 }
 
@@ -174,25 +246,35 @@ func slicesInsert(values []string, index int, value string) []string {
 }
 
 func buildProjectHierarchyFolderTree(rows []projectHierarchyFolderRow, rootParentPath string) []ProjectHierarchyFolderRecord {
-	if len(rows) == 0 { return nil }
+	if len(rows) == 0 {
+		return nil
+	}
 	nodesByPath := make(map[string]*ProjectHierarchyFolderRecord, len(rows))
 	childrenByParent := make(map[string][]string)
 	for _, row := range rows {
 		folderID := strings.TrimSpace(row.ID)
-		if folderID == "" { folderID = row.Path }
+		if folderID == "" {
+			folderID = row.Path
+		}
 		label := strings.TrimSpace(row.Label)
-		if label == "" { label = fallbackFolderLabel(row.Path) }
+		if label == "" {
+			label = fallbackFolderLabel(row.Path)
+		}
 		nodesByPath[row.Path] = &ProjectHierarchyFolderRecord{ID: folderID, Path: row.Path, Label: label, Children: []ProjectHierarchyFolderRecord{}}
 		childrenByParent[row.ParentPath] = append(childrenByParent[row.ParentPath], row.Path)
 	}
 	var build func(parentPath string) []ProjectHierarchyFolderRecord
 	build = func(parentPath string) []ProjectHierarchyFolderRecord {
 		childPaths := childrenByParent[parentPath]
-		if len(childPaths) == 0 { return nil }
+		if len(childPaths) == 0 {
+			return nil
+		}
 		folders := make([]ProjectHierarchyFolderRecord, 0, len(childPaths))
 		for _, childPath := range childPaths {
 			node := nodesByPath[childPath]
-			if node == nil { continue }
+			if node == nil {
+				continue
+			}
 			folder := ProjectHierarchyFolderRecord{ID: node.ID, Path: node.Path, Label: node.Label, Children: build(filepath.ToSlash(filepath.Join(childPath, "children")))}
 			folders = append(folders, folder)
 		}
@@ -202,15 +284,25 @@ func buildProjectHierarchyFolderTree(rows []projectHierarchyFolderRow, rootParen
 }
 
 func buildProjectTreeNodeTree(rows []projectTreeNodeRow, rootParentPath string) []ProjectTreeNodeRecord {
-	if len(rows) == 0 { return nil }
+	if len(rows) == 0 {
+		return nil
+	}
 	nodesByPath := make(map[string]*ProjectTreeNodeRecord, len(rows))
 	childrenByParent := make(map[string][]string)
 	for _, row := range rows {
 		nodeKind := normalizeProjectTreeNodeKind(row.Kind)
 		nodeID := strings.TrimSpace(row.ID)
-		if nodeID == "" { nodeID = row.Path }
+		if nodeID == "" {
+			nodeID = row.Path
+		}
 		label := strings.TrimSpace(row.Label)
-		if label == "" { if nodeKind == "item" { label = fallbackItemLabel(row.Path) } else { label = fallbackFolderLabel(row.Path) } }
+		if label == "" {
+			if nodeKind == "item" {
+				label = fallbackItemLabel(row.Path)
+			} else {
+				label = fallbackFolderLabel(row.Path)
+			}
+		}
 		nodesByPath[row.Path] = &ProjectTreeNodeRecord{ID: nodeID, Path: row.Path, Label: label, Kind: nodeKind, ItemType: normalizeProjectTreeItemType(row.ItemType), Children: []ProjectTreeNodeRecord{}}
 		parentKey := normalizeProjectTreeParentPath(nodeKind, row.ParentPath)
 		childrenByParent[parentKey] = append(childrenByParent[parentKey], row.Path)
@@ -218,13 +310,19 @@ func buildProjectTreeNodeTree(rows []projectTreeNodeRow, rootParentPath string)
 	var build func(parentPath string) []ProjectTreeNodeRecord
 	build = func(parentPath string) []ProjectTreeNodeRecord {
 		childPaths := childrenByParent[parentPath]
-		if len(childPaths) == 0 { return nil }
+		if len(childPaths) == 0 {
+			return nil
+		}
 		nodes := make([]ProjectTreeNodeRecord, 0, len(childPaths))
 		for _, childPath := range childPaths {
 			node := nodesByPath[childPath]
-			if node == nil { continue }
+			if node == nil {
+				continue
+			}
 			nextNode := ProjectTreeNodeRecord{ID: node.ID, Path: node.Path, Label: node.Label, Kind: node.Kind, ItemType: node.ItemType}
-			if node.Kind == "folder" { nextNode.Children = build(node.Path) }
+			if node.Kind == "folder" {
+				nextNode.Children = build(node.Path)
+			}
 			nodes = append(nodes, nextNode)
 		}
 		return nodes
@@ -233,7 +331,9 @@ func buildProjectTreeNodeTree(rows []projectTreeNodeRow, rootParentPath string)
 }
 
 func normalizeProjectTreeParentPath(kind, parentPath string) string {
-	if kind == "folder" && strings.HasSuffix(parentPath, "/children") { return filepath.ToSlash(filepath.Dir(parentPath)) }
+	if kind == "folder" && strings.HasSuffix(parentPath, "/children") {
+		return filepath.ToSlash(filepath.Dir(parentPath))
+	}
 	return parentPath
 }
 
@@ -253,19 +353,35 @@ func applyProjectTreeNodeOrdering(nodes []ProjectTreeNodeRecord, folderOrder map
 }
 
 func applyProjectTreeNodeOrderingForParent(nodes []ProjectTreeNodeRecord, parentID string, folderOrder map[string][]string) []ProjectTreeNodeRecord {
-	if len(nodes) == 0 { return nodes }
+	if len(nodes) == 0 {
+		return nodes
+	}
 	nextNodes := make([]ProjectTreeNodeRecord, len(nodes))
 	copy(nextNodes, nodes)
-	for index := range nextNodes { if nextNodes[index].Kind == "folder" { nextNodes[index].Children = applyProjectTreeNodeOrderingForParent(nextNodes[index].Children, nextNodes[index].ID, folderOrder) } }
+	for index := range nextNodes {
+		if nextNodes[index].Kind == "folder" {
+			nextNodes[index].Children = applyProjectTreeNodeOrderingForParent(nextNodes[index].Children, nextNodes[index].ID, folderOrder)
+		}
+	}
 	orderIDs := folderOrder[projectFolderOrderParentKey(parentID)]
-	if len(orderIDs) == 0 { return nextNodes }
+	if len(orderIDs) == 0 {
+		return nextNodes
+	}
 	rankByID := make(map[string]int, len(orderIDs))
-	for index, id := range orderIDs { if _, exists := rankByID[id]; !exists { rankByID[id] = index } }
+	for index, id := range orderIDs {
+		if _, exists := rankByID[id]; !exists {
+			rankByID[id] = index
+		}
+	}
 	sort.SliceStable(nextNodes, func(left, right int) bool {
 		leftRank, leftOrdered := rankByID[nextNodes[left].ID]
 		rightRank, rightOrdered := rankByID[nextNodes[right].ID]
-		if leftOrdered && rightOrdered { return leftRank < rightRank }
+		if leftOrdered && rightOrdered {
-		if leftOrdered != rightOrdered { return leftOrdered }
+			return leftRank < rightRank
+		}
+		if leftOrdered != rightOrdered {
+			return leftOrdered
+		}
 		return false
 	})
 	return nextNodes
@@ -273,39 +389,57 @@ func applyProjectTreeNodeOrderingForParent(nodes []ProjectTreeNodeRecord, parent
 
 func findProjectHierarchyFolder(folders []ProjectHierarchyFolderRecord, folderID string) (ProjectHierarchyFolderRecord, bool) {
 	for _, folder := range folders {
-		if folder.ID == folderID { return folder, true }
+		if folder.ID == folderID {
-		if child, ok := findProjectHierarchyFolder(folder.Children, folderID); ok { return child, true }
+			return folder, true
+		}
+		if child, ok := findProjectHierarchyFolder(folder.Children, folderID); ok {
+			return child, true
+		}
 	}
 	return ProjectHierarchyFolderRecord{}, false
 }
 
 func findProjectHierarchyFolderByPath(folders []ProjectHierarchyFolderRecord, folderPath string) (ProjectHierarchyFolderRecord, bool) {
 	for _, folder := range folders {
-		if folder.Path == folderPath { return folder, true }
+		if folder.Path == folderPath {
-		if child, ok := findProjectHierarchyFolderByPath(folder.Children, folderPath); ok { return child, true }
+			return folder, true
+		}
+		if child, ok := findProjectHierarchyFolderByPath(folder.Children, folderPath); ok {
+			return child, true
+		}
 	}
 	return ProjectHierarchyFolderRecord{}, false
 }
 
 func findProjectTreeNode(nodes []ProjectTreeNodeRecord, nodeID string) (ProjectTreeNodeRecord, bool) {
 	for _, node := range nodes {
-		if node.ID == nodeID { return node, true }
+		if node.ID == nodeID {
-		if child, ok := findProjectTreeNode(node.Children, nodeID); ok { return child, true }
+			return node, true
+		}
+		if child, ok := findProjectTreeNode(node.Children, nodeID); ok {
+			return child, true
+		}
 	}
 	return ProjectTreeNodeRecord{}, false
 }
 
 func findProjectTreeNodeByPath(nodes []ProjectTreeNodeRecord, nodePath string) (ProjectTreeNodeRecord, bool) {
 	for _, node := range nodes {
-		if node.Path == nodePath { return node, true }
+		if node.Path == nodePath {
-		if child, ok := findProjectTreeNodeByPath(node.Children, nodePath); ok { return child, true }
+			return node, true
+		}
+		if child, ok := findProjectTreeNodeByPath(node.Children, nodePath); ok {
+			return child, true
+		}
 	}
 	return ProjectTreeNodeRecord{}, false
 }
 
 func findProjectTreeFolderByPath(nodes []ProjectTreeNodeRecord, folderPath string) (ProjectTreeNodeRecord, bool) {
 	node, ok := findProjectTreeNodeByPath(nodes, folderPath)
-	if !ok || node.Kind != "folder" { return ProjectTreeNodeRecord{}, false }
+	if !ok || node.Kind != "folder" {
+		return ProjectTreeNodeRecord{}, false
+	}
 	return node, true
 }
 
@@ -314,16 +448,24 @@ func seedProjectTreeOrderParent(folderOrder map[string][]string, nodes []Project
 	trimmedParentID := strings.TrimSpace(parentID)
 	if trimmedParentID != "" {
 		parent, found := findProjectTreeNode(nodes, trimmedParentID)
-		if !found || parent.Kind != "folder" { return }
+		if !found || parent.Kind != "folder" {
+			return
+		}
 		children = parent.Children
 	}
 	parentKey := projectFolderOrderParentKey(parentID)
-	if len(folderOrder[parentKey]) > 0 { return }
+	if len(folderOrder[parentKey]) > 0 {
+		return
+	}
 	orderedIDs := make([]string, 0, len(children))
 	for _, child := range children {
 		trimmedChildID := strings.TrimSpace(child.ID)
-		if trimmedChildID == "" || slicesContains(orderedIDs, trimmedChildID) { continue }
+		if trimmedChildID == "" || slicesContains(orderedIDs, trimmedChildID) {
+			continue
+		}
 		orderedIDs = append(orderedIDs, trimmedChildID)
 	}
-	if len(orderedIDs) > 0 { folderOrder[parentKey] = orderedIDs }
+	if len(orderedIDs) > 0 {
+		folderOrder[parentKey] = orderedIDs
+	}
 }

Backend/internal/bootstrap/project_queries.go

@@ -232,7 +232,7 @@ func (service *Service) getProjectHierarchyFoldersByRootPath(
 			COALESCE(folder_meta.resource_name, directories.resource_name, '')
 		FROM posix_nodes AS directories
 		LEFT JOIN posix_nodes AS folder_meta
-		  ON folder_meta.path = directories.path || '/folder.json'
+		  ON folder_meta.path = directories.path || '/folder.cbor'
 		 AND folder_meta.node_kind = 'file'::posix_node_kind
 		WHERE directories.node_kind = 'directory'::posix_node_kind
 		  AND directories.logical_type = 'hierarchy_folder'
@@ -286,12 +286,11 @@ func (service *Service) getProjectTreeNodesByRootPath(
 			COALESCE(node_meta.content_json->>'type', directories.content_json->>'type', '')
 		FROM posix_nodes AS directories
 		LEFT JOIN posix_nodes AS node_meta
-		  ON node_meta.path = directories.path || CASE
+		  ON node_meta.node_kind = 'file'::posix_node_kind
-				WHEN directories.logical_type = 'hierarchy_folder' THEN '/folder.json'
+		 AND (
-				WHEN directories.logical_type = 'item' THEN '/item.json'
+				(directories.logical_type = 'hierarchy_folder' AND node_meta.path = directories.path || '/folder.cbor')
-				ELSE ''
+				OR (directories.logical_type = 'item' AND node_meta.path = directories.path || '/item.cbor')
-			END
+		 )
-		 AND node_meta.node_kind = 'file'::posix_node_kind
 		WHERE directories.node_kind = 'directory'::posix_node_kind
 		  AND directories.logical_type IN ('hierarchy_folder', 'item')
 		  AND directories.project_slug = $1

Backend/internal/bootstrap/service_test.go

@@ -7,6 +7,9 @@ import (
 	"path/filepath"
 	"strings"
 	"testing"
+
+	"github.com/fxamacker/cbor/v2"
+	"github.com/tailscale/hujson"
 )
 
 type fakeRow struct {
@@ -104,25 +107,28 @@ func TestEnsureBootstrapPOSIXSkeletonInitializesEmptyRoot(t *testing.T) {
 	}
 
 	requiredPaths := []string{
-		filepath.Join(rootPath, "settings.json"),
+		filepath.Join(rootPath, posixSettingsFileName),
-		filepath.Join(rootPath, "layout.json"),
+		filepath.Join(rootPath, posixLayoutFileName),
 		filepath.Join(rootPath, "catalog", "packs"),
 		filepath.Join(rootPath, "catalog", "standalone"),
-		filepath.Join(rootPath, "departments", "department-primary-department", "settings.json"),
+		filepath.Join(rootPath, "catalog", "packs", "pack-core", posixManifestFileName),
-		filepath.Join(rootPath, "departments", "department-primary-department", "users.json"),
+		filepath.Join(rootPath, "catalog", "packs", "pack-core", "entries", "app-shell", posixManifestFileName),
-		filepath.Join(rootPath, "departments", "department-primary-department", "teams", "team-primary-team", "settings.json"),
+		filepath.Join(rootPath, "catalog", "standalone", "app-shell", posixManifestFileName),
-		filepath.Join(rootPath, "departments", "department-primary-department", "teams", "team-primary-team", "users.json"),
+		filepath.Join(rootPath, "departments", "department-primary-department", posixSettingsFileName),
-		filepath.Join(rootPath, "projects", "project-primary-project", "settings.json"),
+		filepath.Join(rootPath, "departments", "department-primary-department", posixUsersFileName),
-		filepath.Join(rootPath, "projects", "project-primary-project", "home.json"),
+		filepath.Join(rootPath, "departments", "department-primary-department", "teams", "team-primary-team", posixSettingsFileName),
-		filepath.Join(rootPath, "projects", "project-primary-project", "acl.json"),
+		filepath.Join(rootPath, "departments", "department-primary-department", "teams", "team-primary-team", posixUsersFileName),
+		filepath.Join(rootPath, "projects", "project-primary-project", posixSettingsFileName),
+		filepath.Join(rootPath, "projects", "project-primary-project", posixHomeFileName),
+		filepath.Join(rootPath, "projects", "project-primary-project", posixACLFileName),
 		filepath.Join(rootPath, "projects", "project-primary-project", "children"),
 		filepath.Join(rootPath, "projects", "project-primary-project", "tree"),
-		filepath.Join(rootPath, "users", "settings.json"),
+		filepath.Join(rootPath, "users", posixSettingsFileName),
-		filepath.Join(rootPath, "users", "data.json"),
+		filepath.Join(rootPath, "users", posixDataFileName),
 		filepath.Join(rootPath, "users", "personals"),
-		filepath.Join(rootPath, "users", "personals", "personal-ronald", "settings.json"),
+		filepath.Join(rootPath, "users", "personals", "personal-ronald", posixSettingsFileName),
-		filepath.Join(rootPath, "users", "personals", "personal-ronald", "layout.json"),
+		filepath.Join(rootPath, "users", "personals", "personal-ronald", posixLayoutFileName),
-		filepath.Join(rootPath, "users", "personals", "personal-ronald", "home.json"),
+		filepath.Join(rootPath, "users", "personals", "personal-ronald", posixHomeFileName),
 		filepath.Join(rootPath, "users", "personals", "personal-ronald", "tree"),
 	}
 
@@ -132,10 +138,10 @@ func TestEnsureBootstrapPOSIXSkeletonInitializesEmptyRoot(t *testing.T) {
 		}
 	}
 
-	settingsPayload := readJSONFileForTest[map[string]any](t, filepath.Join(rootPath, "settings.json"))
+	settingsPayload := readStructuredFileForTest[map[string]any](t, filepath.Join(rootPath, posixSettingsFileName))
 	installationPayload, ok := settingsPayload["installation"].(map[string]any)
 	if !ok {
-		t.Fatalf("settings.json missing installation object: %#v", settingsPayload)
+		t.Fatalf("%s missing installation object: %#v", posixSettingsFileName, settingsPayload)
 	}
 	if installationPayload["name"] != "MangoPig" {
 		t.Fatalf("expected installation name MangoPig, got %#v", installationPayload["name"])
@@ -144,31 +150,53 @@ func TestEnsureBootstrapPOSIXSkeletonInitializesEmptyRoot(t *testing.T) {
 		t.Fatalf("expected installation to be bootstrapped, got %#v", installationPayload["isBootstrapped"])
 	}
 
-	layoutPayload := readJSONFileForTest[map[string]any](t, filepath.Join(rootPath, "layout.json"))
+	layoutPayload := readStructuredFileForTest[map[string]any](t, filepath.Join(rootPath, posixLayoutFileName))
 	homePayload, ok := layoutPayload["home"].(map[string]any)
 	if !ok {
-		t.Fatalf("layout.json missing home object: %#v", layoutPayload)
+		t.Fatalf("%s missing home object: %#v", posixLayoutFileName, layoutPayload)
 	}
 	if homePayload["defaultProjectSlug"] != "primary-project" {
 		t.Fatalf("expected default project slug primary-project, got %#v", homePayload["defaultProjectSlug"])
 	}
 
-	projectSettings := readJSONFileForTest[map[string]any](t, filepath.Join(rootPath, "projects", "project-primary-project", "settings.json"))
+	packManifest := readStructuredFileForTest[map[string]any](t, filepath.Join(rootPath, "catalog", "packs", "pack-core", posixManifestFileName))
+	if packManifest["type"] != "pack" {
+		t.Fatalf("expected pack manifest type pack, got %#v", packManifest["type"])
+	}
+	if packManifest["slug"] != "core" {
+		t.Fatalf("expected pack manifest slug core, got %#v", packManifest["slug"])
+	}
+
+	entryManifest := readStructuredFileForTest[map[string]any](t, filepath.Join(rootPath, "catalog", "packs", "pack-core", "entries", "app-shell", posixManifestFileName))
+	runtimePayload, ok := entryManifest["runtime"].(map[string]any)
+	if !ok {
+		t.Fatalf("%s missing runtime object: %#v", posixManifestFileName, entryManifest)
+	}
+	if runtimePayload["path"] != "/v1/app-shell" {
+		t.Fatalf("expected app-shell runtime path /v1/app-shell, got %#v", runtimePayload["path"])
+	}
+
+	standaloneManifest := readStructuredFileForTest[map[string]any](t, filepath.Join(rootPath, "catalog", "standalone", "app-shell", posixManifestFileName))
+	if standaloneManifest["source"] != "standalone" {
+		t.Fatalf("expected standalone manifest source standalone, got %#v", standaloneManifest["source"])
+	}
+
+	projectSettings := readStructuredFileForTest[map[string]any](t, filepath.Join(rootPath, "projects", "project-primary-project", posixSettingsFileName))
 	if projectSettings["type"] != "project" {
 		t.Fatalf("expected project settings type project, got %#v", projectSettings["type"])
 	}
 
-	projectACL := readJSONFileForTest[map[string]any](t, filepath.Join(rootPath, "projects", "project-primary-project", "acl.json"))
+	projectACL := readStructuredFileForTest[map[string]any](t, filepath.Join(rootPath, "projects", "project-primary-project", posixACLFileName))
 	if projectACL["inherits"] != true {
 		t.Fatalf("expected project acl to inherit by default, got %#v", projectACL["inherits"])
 	}
 
-	usersSettings := readJSONFileForTest[map[string]any](t, filepath.Join(rootPath, "users", "settings.json"))
+	usersSettings := readStructuredFileForTest[map[string]any](t, filepath.Join(rootPath, "users", posixSettingsFileName))
 	if usersSettings["primaryAdminId"] != "admin-1" {
 		t.Fatalf("expected primary admin id admin-1, got %#v", usersSettings["primaryAdminId"])
 	}
 
-	personalSettings := readJSONFileForTest[map[string]any](t, filepath.Join(rootPath, "users", "personals", "personal-ronald", "settings.json"))
+	personalSettings := readStructuredFileForTest[map[string]any](t, filepath.Join(rootPath, "users", "personals", "personal-ronald", posixSettingsFileName))
 	if personalSettings["type"] != "personal" {
 		t.Fatalf("expected personal settings type personal, got %#v", personalSettings["type"])
 	}
@@ -179,7 +207,7 @@ func TestEnsureBootstrapPOSIXSkeletonInitializesEmptyRoot(t *testing.T) {
 		t.Fatalf("expected personal slug ronald, got %#v", personalSettings["slug"])
 	}
 
-	personalHome := readJSONFileForTest[map[string]any](t, filepath.Join(rootPath, "users", "personals", "personal-ronald", "home.json"))
+	personalHome := readStructuredFileForTest[map[string]any](t, filepath.Join(rootPath, "users", "personals", "personal-ronald", posixHomeFileName))
 	if personalHome["type"] != "personal-home" {
 		t.Fatalf("expected personal home type personal-home, got %#v", personalHome["type"])
 	}
@@ -217,8 +245,8 @@ func TestCreateProjectHierarchyFolderOnDiskCreatesExpectedFolderShape(t *testing
 
 	createdFolderPath := filepath.Join(rootPath, "projects", "project-primary-project", "children", "folder-design-system")
 	for _, path := range []string{
-		filepath.Join(createdFolderPath, "folder.json"),
+		filepath.Join(createdFolderPath, posixFolderFileName),
-		filepath.Join(createdFolderPath, "acl.json"),
+		filepath.Join(createdFolderPath, posixACLFileName),
 		filepath.Join(createdFolderPath, "children"),
 	} {
 		if _, err := os.Stat(path); err != nil {
@@ -226,7 +254,7 @@ func TestCreateProjectHierarchyFolderOnDiskCreatesExpectedFolderShape(t *testing
 		}
 	}
 
-	folderPayload := readJSONFileForTest[map[string]any](t, filepath.Join(createdFolderPath, "folder.json"))
+	folderPayload := readStructuredFileForTest[map[string]any](t, filepath.Join(createdFolderPath, posixFolderFileName))
 	if strings.TrimSpace(asStringForTest(folderPayload["id"])) == "" {
 		t.Fatalf("expected created folder to have stable id, got %#v", folderPayload["id"])
 	}
@@ -278,8 +306,8 @@ func TestCreateProjectTreeFolderOnDiskCreatesExpectedFolderShape(t *testing.T) {
 
 	createdFolderPath := filepath.Join(rootPath, "projects", "project-primary-project", "tree", "folder-docs")
 	for _, path := range []string{
-		filepath.Join(createdFolderPath, "folder.json"),
+		filepath.Join(createdFolderPath, posixFolderFileName),
-		filepath.Join(createdFolderPath, "acl.json"),
+		filepath.Join(createdFolderPath, posixACLFileName),
 		filepath.Join(createdFolderPath, "children"),
 	} {
 		if _, err := os.Stat(path); err != nil {
@@ -345,7 +373,7 @@ func TestRenameProjectHierarchyFolderOnDiskRenamesFolderShape(t *testing.T) {
 		t.Fatalf("expected nested child folder to move with renamed parent: %v", err)
 	}
 
-	folderPayload := readJSONFileForTest[map[string]any](t, filepath.Join(renamedFolderPath, "folder.json"))
+	folderPayload := readStructuredFileForTest[map[string]any](t, filepath.Join(renamedFolderPath, posixFolderFileName))
 	if strings.TrimSpace(asStringForTest(folderPayload["id"])) == "" {
 		t.Fatalf("expected renamed folder to preserve stable id, got %#v", folderPayload["id"])
 	}
@@ -392,7 +420,7 @@ func TestRenameProjectTreeFolderOnDiskRenamesFolderShape(t *testing.T) {
 		t.Fatalf("unexpected renamed path: %s", renamedPath)
 	}
 
-	folderPayload := readJSONFileForTest[map[string]any](t, filepath.Join(rootPath, filepath.FromSlash(renamedPath), "folder.json"))
+	folderPayload := readStructuredFileForTest[map[string]any](t, filepath.Join(rootPath, filepath.FromSlash(renamedPath), posixFolderFileName))
 	if folderPayload["name"] != "Specifications" {
 		t.Fatalf("expected renamed folder name Specifications, got %#v", folderPayload["name"])
 	}
@@ -454,7 +482,7 @@ func TestMoveProjectHierarchyFolderOnDiskMovesFolderToNewParent(t *testing.T) {
 		t.Fatalf("expected nested child folder to move with moved parent: %v", err)
 	}
 
-	folderPayload := readJSONFileForTest[map[string]any](t, filepath.Join(movedFolderPath, "folder.json"))
+	folderPayload := readStructuredFileForTest[map[string]any](t, filepath.Join(movedFolderPath, posixFolderFileName))
 	if strings.TrimSpace(asStringForTest(folderPayload["id"])) == "" {
 		t.Fatalf("expected moved folder to preserve stable id, got %#v", folderPayload["id"])
 	}
@@ -505,7 +533,7 @@ func TestMoveProjectTreeFolderOnDiskMovesFolderToNewParent(t *testing.T) {
 		t.Fatalf("unexpected moved path: %s", movedPath)
 	}
 
-	folderPayload := readJSONFileForTest[map[string]any](t, filepath.Join(rootPath, filepath.FromSlash(movedPath), "folder.json"))
+	folderPayload := readStructuredFileForTest[map[string]any](t, filepath.Join(rootPath, filepath.FromSlash(movedPath), posixFolderFileName))
 	if folderPayload["name"] != "Docs" {
 		t.Fatalf("expected moved folder name Docs, got %#v", folderPayload["name"])
 	}
@@ -622,7 +650,7 @@ func asStringForTest(value any) string {
 	return text
 }
 
-func readJSONFileForTest[T any](t *testing.T, path string) T {
+func readStructuredFileForTest[T any](t *testing.T, path string) T {
 	t.Helper()
 
 	data, err := os.ReadFile(path)
@@ -630,9 +658,37 @@ func readJSONFileForTest[T any](t *testing.T, path string) T {
 		t.Fatalf("read %s: %v", path, err)
 	}
 
+	var raw any
+	switch strings.ToLower(filepath.Ext(path)) {
+	case ".cbor":
+		if err := cbor.Unmarshal(data, &raw); err != nil {
+			t.Fatalf("unmarshal %s: %v", path, err)
+		}
+	case ".json":
+		if err := json.Unmarshal(data, &raw); err != nil {
+			t.Fatalf("unmarshal %s: %v", path, err)
+		}
+	case ".jsonc":
+		ast, err := hujson.Parse(data)
+		if err != nil {
+			t.Fatalf("parse jsonc %s: %v", path, err)
+		}
+		ast.Standardize()
+		if err := json.Unmarshal(ast.Pack(), &raw); err != nil {
+			t.Fatalf("unmarshal standardized %s: %v", path, err)
+		}
+	default:
+		t.Fatalf("unsupported structured test file %s", path)
+	}
+
+	normalizedBytes, err := json.Marshal(normalizeStructuredValue(raw))
+	if err != nil {
+		t.Fatalf("normalize %s: %v", path, err)
+	}
+
 	var payload T
-	if err := json.Unmarshal(data, &payload); err != nil {
+	if err := json.Unmarshal(normalizedBytes, &payload); err != nil {
-		t.Fatalf("unmarshal %s: %v", path, err)
+		t.Fatalf("decode normalized %s: %v", path, err)
 	}
 
 	return payload

Backend/internal/posixproj/projector_classify.go

@@ -28,8 +28,10 @@ func deriveScope(relPath string, rootScope Scope) Scope {
 func classifyPath(relPath string, isDir bool) (logicalType, fileRole string) {
 	parts := strings.Split(relPath, "/")
 	name := parts[len(parts)-1]
+	ext := strings.ToLower(filepath.Ext(name))
+	structuredRole := strings.TrimSuffix(name, filepath.Ext(name))
 	if !isDir {
-		fileRole = strings.TrimSuffix(name, filepath.Ext(name))
+		fileRole = structuredRole
 	}
 
 	hasChildrenAncestor := pathContainsSegment(parts, "children")
@@ -40,9 +42,9 @@ func classifyPath(relPath string, isDir bool) (logicalType, fileRole string) {
 	}
 
 	switch {
-	case relPath == "settings.json":
+	case !isDir && structuredRole == "settings" && len(parts) == 1 && ext == ".cbor":
 		return "tenant", "settings"
-	case relPath == "layout.json":
+	case !isDir && structuredRole == "layout" && len(parts) == 1 && ext == ".cbor":
 		return "tenant", "layout"
 	case len(parts) >= 1 && parts[0] == "catalog":
 		if isDir {
@@ -50,60 +52,110 @@ func classifyPath(relPath string, isDir bool) (logicalType, fileRole string) {
 				return "catalog", ""
 			}
 			if len(parts) >= 2 && parts[1] == "packs" {
-				if len(parts) == 2 { return "catalog_packs", "" }
+				if len(parts) == 2 {
-				if len(parts) == 3 { return "catalog_pack", "" }
+					return "catalog_packs", ""
-				if len(parts) >= 4 && parts[3] == "entries" { return "catalog_pack_entries", "" }
+				}
+				if len(parts) == 3 {
+					return "catalog_pack", ""
+				}
+				if len(parts) >= 4 && parts[3] == "entries" {
+					return "catalog_pack_entries", ""
+				}
 				return "catalog_entry", ""
 			}
 			if len(parts) >= 2 && parts[1] == "standalone" {
-				if len(parts) == 2 { return "catalog_standalone", "" }
+				if len(parts) == 2 {
+					return "catalog_standalone", ""
+				}
 				return "catalog_entry", ""
 			}
 		}
 		return "catalog", fileRole
 	case len(parts) >= 2 && parts[0] == "departments" && strings.HasPrefix(parts[1], "department-"):
 		if isDir {
-			if len(parts) == 2 { return "department", "" }
+			if len(parts) == 2 {
-			if len(parts) == 3 && parts[2] == "teams" { return "department_teams", "" }
+				return "department", ""
-			if len(parts) >= 4 && strings.HasPrefix(parts[3], "team-") { return "team", "" }
+			}
+			if len(parts) == 3 && parts[2] == "teams" {
+				return "department_teams", ""
+			}
+			if len(parts) >= 4 && strings.HasPrefix(parts[3], "team-") {
+				return "team", ""
+			}
+		}
+		if len(parts) >= 4 && strings.HasPrefix(parts[3], "team-") {
+			return "team", fileRole
 		}
-		if len(parts) >= 4 && strings.HasPrefix(parts[3], "team-") { return "team", fileRole }
 		return "department", fileRole
 	case len(parts) >= 2 && parts[0] == "projects" && strings.HasPrefix(parts[1], "project-"):
 		if isDir {
-			if strings.HasPrefix(name, "project-") { return "project", "" }
+			if strings.HasPrefix(name, "project-") {
-			if name == "children" { return "project_children", "" }
+				return "project", ""
-			if name == "tree" { return "project_tree", "" }
+			}
-			if hasChildrenAncestor && strings.HasPrefix(name, "folder-") { return "hierarchy_folder", "" }
+			if name == "children" {
-			if hasTreeAncestor && strings.HasPrefix(name, "folder-") { return "hierarchy_folder", "" }
+				return "project_children", ""
-			if hasTreeAncestor && strings.HasPrefix(name, "item-") { return "item", "" }
+			}
+			if name == "tree" {
+				return "project_tree", ""
+			}
+			if hasChildrenAncestor && strings.HasPrefix(name, "folder-") {
+				return "hierarchy_folder", ""
+			}
+			if hasTreeAncestor && strings.HasPrefix(name, "folder-") {
+				return "hierarchy_folder", ""
+			}
+			if hasTreeAncestor && strings.HasPrefix(name, "item-") {
+				return "item", ""
+			}
+		}
+		if hasChildrenAncestor && strings.HasPrefix(parentName, "folder-") {
+			return "hierarchy_folder", fileRole
 		}
-		if hasChildrenAncestor && strings.HasPrefix(parentName, "folder-") { return "hierarchy_folder", fileRole }
 		if hasTreeAncestor {
-			if strings.HasPrefix(parentName, "item-") { return "item", fileRole }
+			if strings.HasPrefix(parentName, "item-") {
-			if strings.HasPrefix(parentName, "folder-") { return "hierarchy_folder", fileRole }
+				return "item", fileRole
+			}
+			if strings.HasPrefix(parentName, "folder-") {
+				return "hierarchy_folder", fileRole
+			}
 		}
 		return "project", fileRole
 	case len(parts) >= 1 && parts[0] == "users":
 		if isDir {
-			if len(parts) == 1 { return "users", "" }
+			if len(parts) == 1 {
-			if len(parts) == 2 && parts[1] == "personals" { return "personals", "" }
+				return "users", ""
-			if len(parts) >= 3 && parts[1] == "personals" && strings.HasPrefix(parts[2], "personal-") { return "personal", "" }
+			}
+			if len(parts) == 2 && parts[1] == "personals" {
+				return "personals", ""
+			}
+			if len(parts) >= 3 && parts[1] == "personals" && strings.HasPrefix(parts[2], "personal-") {
+				return "personal", ""
+			}
 			if strings.Contains(relPath, "/tree/") || strings.HasSuffix(relPath, "/tree") {
-				if strings.HasPrefix(name, "folder-") { return "folder", "" }
+				if strings.HasPrefix(name, "folder-") {
-				if strings.HasPrefix(name, "item-") { return "item", "" }
+					return "folder", ""
+				}
+				if strings.HasPrefix(name, "item-") {
+					return "item", ""
+				}
 			}
 		}
 		if len(parts) >= 3 && parts[1] == "personals" && strings.HasPrefix(parts[2], "personal-") {
 			if strings.Contains(relPath, "/tree/") {
-				if strings.HasPrefix(parts[len(parts)-2], "item-") { return "item", fileRole }
+				if strings.HasPrefix(parts[len(parts)-2], "item-") {
-				if strings.HasPrefix(parts[len(parts)-2], "folder-") { return "folder", fileRole }
+					return "item", fileRole
+				}
+				if strings.HasPrefix(parts[len(parts)-2], "folder-") {
+					return "folder", fileRole
+				}
 			}
 			return "personal", fileRole
 		}
 		return "users", fileRole
 	default:
-		if isDir { return "directory", "" }
+		if isDir {
+			return "directory", ""
+		}
 		return "file", fileRole
 	}
 }

Backend/internal/posixproj/projector_scan.go

@@ -11,6 +11,13 @@ import (
 	"os"
 	"path/filepath"
 	"strings"
+
+	"github.com/fxamacker/cbor/v2"
+	"github.com/tailscale/hujson"
+)
+
+const (
+	settingsCBORPath = "settings.cbor"
 )
 
 func ScanRoot(root string) ([]Node, error) {
@@ -77,18 +84,21 @@ func ScanRoot(root string) ([]Node, error) {
 }
 
 func loadRootScope(rootPath string) (Scope, error) {
-	settingsPath := filepath.Join(rootPath, "settings.json")
+	settingsPath := filepath.Join(rootPath, settingsCBORPath)
 	content, err := os.ReadFile(settingsPath)
 	if err != nil {
 		if errorsIsNotExist(err) {
 			return Scope{}, nil
 		}
-		return Scope{}, fmt.Errorf("read root settings.json: %w", err)
+		return Scope{}, fmt.Errorf("read root %s: %w", filepath.Base(settingsPath), err)
 	}
 
-	var payload map[string]any
+	payload, err := decodeStructuredMap(settingsPath, content)
-	if err := json.Unmarshal(content, &payload); err != nil {
+	if err != nil {
-		return Scope{}, fmt.Errorf("decode root settings.json: %w", err)
+		return Scope{}, fmt.Errorf("decode root %s: %w", filepath.Base(settingsPath), err)
+	}
+	if len(payload) == 0 {
+		return Scope{}, nil
 	}
 
 	installation, _ := payload["installation"].(map[string]any)
@@ -138,9 +148,9 @@ func buildNode(rootPath, relPath string, entry fs.DirEntry, rootScope Scope) (No
 	node.SizeBytes = int64(len(content))
 	node.Checksum = hex.EncodeToString(hash[:])
 
-	if strings.EqualFold(filepath.Ext(entry.Name()), ".json") {
+	if isStructuredProjectionFile(entry.Name()) {
-		var payload map[string]any
+		payload, err := decodeStructuredMap(absPath, content)
-		if err := json.Unmarshal(content, &payload); err == nil {
+		if err == nil {
 			jsonContent, err := json.Marshal(payload)
 			if err != nil {
 				return Node{}, fmt.Errorf("remarshal POSIX file %s: %w", relPath, err)
@@ -171,6 +181,84 @@ func buildNode(rootPath, relPath string, entry fs.DirEntry, rootScope Scope) (No
 	return node, nil
 }
 
+func isStructuredProjectionFile(name string) bool {
+	switch strings.ToLower(filepath.Ext(name)) {
+	case ".json", ".jsonc", ".cbor":
+		return true
+	default:
+		return false
+	}
+}
+
+func decodeStructuredMap(path string, content []byte) (map[string]any, error) {
+	var payload any
+	switch strings.ToLower(filepath.Ext(path)) {
+	case ".cbor":
+		if err := cbor.Unmarshal(content, &payload); err != nil {
+			return nil, err
+		}
+	case ".json":
+		if err := json.Unmarshal(content, &payload); err != nil {
+			return nil, err
+		}
+	case ".jsonc":
+		decoded, err := decodeJSONCToAny(content)
+		if err != nil {
+			return nil, err
+		}
+		payload = decoded
+	default:
+		return nil, fmt.Errorf("unsupported structured file extension %q", filepath.Ext(path))
+	}
+	if payload == nil {
+		return map[string]any{}, nil
+	}
+	normalized, ok := normalizeStructuredValue(payload).(map[string]any)
+	if !ok || normalized == nil {
+		return map[string]any{}, nil
+	}
+	return normalized, nil
+}
+
+func decodeJSONCToAny(content []byte) (any, error) {
+	ast, err := hujson.Parse(content)
+	if err != nil {
+		return nil, err
+	}
+	ast.Standardize()
+	standardized := ast.Pack()
+	var payload any
+	if err := json.Unmarshal(standardized, &payload); err != nil {
+		return nil, err
+	}
+	return payload, nil
+}
+
+func normalizeStructuredValue(value any) any {
+	switch typed := value.(type) {
+	case map[string]any:
+		normalized := make(map[string]any, len(typed))
+		for key, child := range typed {
+			normalized[key] = normalizeStructuredValue(child)
+		}
+		return normalized
+	case map[any]any:
+		normalized := make(map[string]any, len(typed))
+		for key, child := range typed {
+			normalized[fmt.Sprint(key)] = normalizeStructuredValue(child)
+		}
+		return normalized
+	case []any:
+		normalized := make([]any, len(typed))
+		for index, child := range typed {
+			normalized[index] = normalizeStructuredValue(child)
+		}
+		return normalized
+	default:
+		return value
+	}
+}
+
 func summarizeNodes(nodes []Node) RebuildSummary {
 	summary := RebuildSummary{TotalNodes: len(nodes)}
 	for _, node := range nodes {

Backend/internal/posixproj/projector_test.go

@@ -7,6 +7,21 @@ import (
 	"os"
 	"path/filepath"
 	"testing"
+
+	"github.com/fxamacker/cbor/v2"
+)
+
+const (
+	testSettingsFileName = "settings.cbor"
+	testLayoutFileName   = "layout.cbor"
+	testHomeFileName     = "home.cbor"
+	testUsersFileName    = "users.cbor"
+	testACLFileName      = "acl.cbor"
+	testFolderFileName   = "folder.cbor"
+	testItemFileName     = "item.cbor"
+	testDataFileName     = "data.cbor"
+	testSchemaFileName   = "schema.json"
+	testManifestFileName = "manifest.jsonc"
 )
 
 func TestScanRootBuildsProjectedNodesFromBootstrapShape(t *testing.T) {
@@ -14,6 +29,8 @@ func TestScanRootBuildsProjectedNodesFromBootstrapShape(t *testing.T) {
 
 	mustMkdirAll(t, filepath.Join(root, "catalog", "packs"))
 	mustMkdirAll(t, filepath.Join(root, "catalog", "standalone"))
+	mustMkdirAll(t, filepath.Join(root, "catalog", "packs", "pack-core", "entries", "app-shell"))
+	mustMkdirAll(t, filepath.Join(root, "catalog", "standalone", "app-shell"))
 	mustMkdirAll(t, filepath.Join(root, "departments", "department-primary-department", "teams", "team-primary-team"))
 	mustMkdirAll(t, filepath.Join(root, "projects", "project-primary-project", "children", "folder-design", "children", "project-web", "children"))
 	mustMkdirAll(t, filepath.Join(root, "projects", "project-primary-project", "children", "folder-design", "children", "project-web", "tree"))
@@ -22,7 +39,7 @@ func TestScanRootBuildsProjectedNodesFromBootstrapShape(t *testing.T) {
 	mustMkdirAll(t, filepath.Join(root, "projects", "project-primary-project", "tree", "folder-docs", "item-roadmap"))
 	mustMkdirAll(t, filepath.Join(root, "users", "personals"))
 
-	mustWriteJSON(t, filepath.Join(root, "settings.json"), map[string]any{
+	mustWriteStructured(t, filepath.Join(root, testSettingsFileName), map[string]any{
 		"installation": map[string]any{
 			"id":             "installation-1",
 			"name":           "MangoPig",
@@ -34,81 +51,103 @@ func TestScanRootBuildsProjectedNodesFromBootstrapShape(t *testing.T) {
 			"slug": "primary-organization",
 		},
 	})
-	mustWriteJSON(t, filepath.Join(root, "layout.json"), map[string]any{
+	mustWriteStructured(t, filepath.Join(root, testLayoutFileName), map[string]any{
 		"type": "tenant-layout",
 		"home": map[string]any{"defaultProjectSlug": "primary-project"},
 	})
-	mustWriteJSON(t, filepath.Join(root, "departments", "department-primary-department", "settings.json"), map[string]any{
+	mustWriteStructured(t, filepath.Join(root, "catalog", "packs", "pack-core", testManifestFileName), map[string]any{
+		"id":      "pack-core",
+		"slug":    "core",
+		"type":    "pack",
+		"name":    "Core Pack",
+		"entries": []map[string]any{{"slug": "app-shell", "path": "entries/app-shell"}},
+	})
+	mustWriteStructured(t, filepath.Join(root, "catalog", "packs", "pack-core", "entries", "app-shell", testManifestFileName), map[string]any{
+		"id":   "app-shell",
+		"slug": "app-shell",
+		"type": "app",
+		"runtime": map[string]any{
+			"kind": "route",
+			"path": "/v1/app-shell",
+		},
+	})
+	mustWriteStructured(t, filepath.Join(root, "catalog", "standalone", "app-shell", testManifestFileName), map[string]any{
+		"id":     "app-shell",
+		"slug":   "app-shell",
+		"type":   "app",
+		"source": "standalone",
+	})
+	mustWriteStructured(t, filepath.Join(root, "departments", "department-primary-department", testSettingsFileName), map[string]any{
 		"id":   "dept-1",
 		"name": "Primary Department",
 		"slug": "primary-department",
 		"type": "department",
 	})
-	mustWriteJSON(t, filepath.Join(root, "departments", "department-primary-department", "users.json"), map[string]any{
+	mustWriteStructured(t, filepath.Join(root, "departments", "department-primary-department", testUsersFileName), map[string]any{
 		"users": []map[string]any{{"id": "admin-1"}},
 	})
-	mustWriteJSON(t, filepath.Join(root, "departments", "department-primary-department", "teams", "team-primary-team", "settings.json"), map[string]any{
+	mustWriteStructured(t, filepath.Join(root, "departments", "department-primary-department", "teams", "team-primary-team", testSettingsFileName), map[string]any{
 		"id":   "team-1",
 		"name": "Primary Team",
 		"slug": "primary-team",
 		"type": "team",
 	})
-	mustWriteJSON(t, filepath.Join(root, "projects", "project-primary-project", "settings.json"), map[string]any{
+	mustWriteStructured(t, filepath.Join(root, "projects", "project-primary-project", testSettingsFileName), map[string]any{
 		"id":   "project-1",
 		"name": "Primary Project",
 		"slug": "primary-project",
 		"type": "project",
 	})
-	mustWriteJSON(t, filepath.Join(root, "projects", "project-primary-project", "home.json"), map[string]any{
+	mustWriteStructured(t, filepath.Join(root, "projects", "project-primary-project", testHomeFileName), map[string]any{
 		"type":    "project-home",
 		"project": "primary-project",
 	})
-	mustWriteJSON(t, filepath.Join(root, "projects", "project-primary-project", "acl.json"), map[string]any{
+	mustWriteStructured(t, filepath.Join(root, "projects", "project-primary-project", testACLFileName), map[string]any{
 		"inherits": true,
 		"rules":    []any{},
 	})
-	mustWriteJSON(t, filepath.Join(root, "projects", "project-primary-project", "children", "folder-design", "folder.json"), map[string]any{
+	mustWriteStructured(t, filepath.Join(root, "projects", "project-primary-project", "children", "folder-design", testFolderFileName), map[string]any{
 		"name": "Design",
 		"slug": "design",
 	})
-	mustWriteJSON(t, filepath.Join(root, "projects", "project-primary-project", "children", "folder-design", "acl.json"), map[string]any{
+	mustWriteStructured(t, filepath.Join(root, "projects", "project-primary-project", "children", "folder-design", testACLFileName), map[string]any{
 		"inherits": true,
 		"rules":    []any{},
 	})
-	mustWriteJSON(t, filepath.Join(root, "projects", "project-primary-project", "children", "folder-design", "children", "project-web", "settings.json"), map[string]any{
+	mustWriteStructured(t, filepath.Join(root, "projects", "project-primary-project", "children", "folder-design", "children", "project-web", testSettingsFileName), map[string]any{
 		"id":   "project-2",
 		"name": "Web Project",
 		"slug": "web",
 		"type": "project",
 	})
-	mustWriteJSON(t, filepath.Join(root, "projects", "project-primary-project", "children", "folder-design", "children", "project-web", "home.json"), map[string]any{
+	mustWriteStructured(t, filepath.Join(root, "projects", "project-primary-project", "children", "folder-design", "children", "project-web", testHomeFileName), map[string]any{
 		"type":    "project-home",
 		"project": "web",
 	})
-	mustWriteJSON(t, filepath.Join(root, "projects", "project-primary-project", "children", "folder-design", "children", "project-web", "acl.json"), map[string]any{
+	mustWriteStructured(t, filepath.Join(root, "projects", "project-primary-project", "children", "folder-design", "children", "project-web", testACLFileName), map[string]any{
 		"inherits": true,
 		"rules":    []any{},
 	})
-	mustWriteJSON(t, filepath.Join(root, "projects", "project-primary-project", "tree", "folder-docs", "folder.json"), map[string]any{
+	mustWriteStructured(t, filepath.Join(root, "projects", "project-primary-project", "tree", "folder-docs", testFolderFileName), map[string]any{
 		"name": "Docs",
 		"slug": "docs",
 	})
-	mustWriteJSON(t, filepath.Join(root, "projects", "project-primary-project", "tree", "folder-docs", "item-roadmap", "item.json"), map[string]any{
+	mustWriteStructured(t, filepath.Join(root, "projects", "project-primary-project", "tree", "folder-docs", "item-roadmap", testItemFileName), map[string]any{
 		"id":   "item-1",
 		"name": "Roadmap",
 		"slug": "roadmap",
 		"type": "board",
 	})
-	mustWriteJSON(t, filepath.Join(root, "projects", "project-primary-project", "tree", "folder-docs", "item-roadmap", "schema.json"), map[string]any{
+	mustWriteStructured(t, filepath.Join(root, "projects", "project-primary-project", "tree", "folder-docs", "item-roadmap", testSchemaFileName), map[string]any{
 		"type": "object",
 	})
-	mustWriteJSON(t, filepath.Join(root, "projects", "project-primary-project", "tree", "folder-docs", "item-roadmap", "data.json"), map[string]any{
+	mustWriteStructured(t, filepath.Join(root, "projects", "project-primary-project", "tree", "folder-docs", "item-roadmap", testDataFileName), map[string]any{
 		"title": "Roadmap",
 	})
-	mustWriteJSON(t, filepath.Join(root, "users", "settings.json"), map[string]any{
+	mustWriteStructured(t, filepath.Join(root, "users", testSettingsFileName), map[string]any{
 		"primaryAdminId": "admin-1",
 	})
-	mustWriteJSON(t, filepath.Join(root, "users", "data.json"), map[string]any{
+	mustWriteStructured(t, filepath.Join(root, "users", testDataFileName), map[string]any{
 		"users": []map[string]any{{"id": "admin-1", "email": "ronald@example.com"}},
 	})
 
@@ -133,7 +172,7 @@ func TestScanRootBuildsProjectedNodesFromBootstrapShape(t *testing.T) {
 		t.Fatalf("expected root organization slug primary-organization, got %q", rootNode.OrganizationSlug)
 	}
 
-	tenantSettings := index["settings.json"]
+	tenantSettings := index[testSettingsFileName]
 	if tenantSettings.LogicalType != "tenant" || tenantSettings.FileRole != "settings" {
 		t.Fatalf("unexpected tenant settings classification: %#v", tenantSettings)
 	}
@@ -141,7 +180,31 @@ func TestScanRootBuildsProjectedNodesFromBootstrapShape(t *testing.T) {
 		t.Fatalf("expected installation id installation-1, got %q", tenantSettings.InstallationID)
 	}
 
-	deptSettings := index["departments/department-primary-department/settings.json"]
+	packManifest := index[filepath.ToSlash(filepath.Join("catalog", "packs", "pack-core", testManifestFileName))]
+	if packManifest.LogicalType != "catalog" || packManifest.FileRole != "manifest" {
+		t.Fatalf("unexpected pack manifest classification: %#v", packManifest)
+	}
+	if packManifest.ResourceSlug != "core" {
+		t.Fatalf("expected pack manifest resource slug core, got %q", packManifest.ResourceSlug)
+	}
+
+	entryManifest := index[filepath.ToSlash(filepath.Join("catalog", "packs", "pack-core", "entries", "app-shell", testManifestFileName))]
+	if entryManifest.LogicalType != "catalog" || entryManifest.FileRole != "manifest" {
+		t.Fatalf("unexpected catalog entry manifest classification: %#v", entryManifest)
+	}
+	if entryManifest.ResourceID != "app-shell" {
+		t.Fatalf("expected catalog entry manifest resource id app-shell, got %q", entryManifest.ResourceID)
+	}
+
+	standaloneManifest := index[filepath.ToSlash(filepath.Join("catalog", "standalone", "app-shell", testManifestFileName))]
+	if standaloneManifest.LogicalType != "catalog" || standaloneManifest.FileRole != "manifest" {
+		t.Fatalf("unexpected standalone manifest classification: %#v", standaloneManifest)
+	}
+	if standaloneManifest.ResourceSlug != "app-shell" {
+		t.Fatalf("expected standalone manifest resource slug app-shell, got %q", standaloneManifest.ResourceSlug)
+	}
+
+	deptSettings := index[filepath.ToSlash(filepath.Join("departments", "department-primary-department", testSettingsFileName))]
 	if deptSettings.DepartmentSlug != "primary-department" {
 		t.Fatalf("expected department slug primary-department, got %q", deptSettings.DepartmentSlug)
 	}
@@ -149,12 +212,12 @@ func TestScanRootBuildsProjectedNodesFromBootstrapShape(t *testing.T) {
 		t.Fatalf("expected department resource id dept-1, got %q", deptSettings.ResourceID)
 	}
 
-	teamSettings := index["departments/department-primary-department/teams/team-primary-team/settings.json"]
+	teamSettings := index[filepath.ToSlash(filepath.Join("departments", "department-primary-department", "teams", "team-primary-team", testSettingsFileName))]
 	if teamSettings.TeamSlug != "primary-team" {
 		t.Fatalf("expected team slug primary-team, got %q", teamSettings.TeamSlug)
 	}
 
-	projectSettings := index["projects/project-primary-project/settings.json"]
+	projectSettings := index[filepath.ToSlash(filepath.Join("projects", "project-primary-project", testSettingsFileName))]
 	if projectSettings.ProjectSlug != "primary-project" {
 		t.Fatalf("expected project slug primary-project, got %q", projectSettings.ProjectSlug)
 	}
@@ -177,12 +240,12 @@ func TestScanRootBuildsProjectedNodesFromBootstrapShape(t *testing.T) {
 		t.Fatalf("unexpected hierarchy folder node: %#v", hierarchyFolder)
 	}
 
-	hierarchyFolderACL := index["projects/project-primary-project/children/folder-design/acl.json"]
+	hierarchyFolderACL := index[filepath.ToSlash(filepath.Join("projects", "project-primary-project", "children", "folder-design", testACLFileName))]
 	if hierarchyFolderACL.LogicalType != "hierarchy_folder" || hierarchyFolderACL.FileRole != "acl" {
 		t.Fatalf("unexpected hierarchy folder acl classification: %#v", hierarchyFolderACL)
 	}
 
-	childProjectSettings := index["projects/project-primary-project/children/folder-design/children/project-web/settings.json"]
+	childProjectSettings := index[filepath.ToSlash(filepath.Join("projects", "project-primary-project", "children", "folder-design", "children", "project-web", testSettingsFileName))]
 	if childProjectSettings.LogicalType != "project" || childProjectSettings.ProjectSlug != "web" {
 		t.Fatalf("unexpected child project classification: %#v", childProjectSettings)
 	}
@@ -192,12 +255,12 @@ func TestScanRootBuildsProjectedNodesFromBootstrapShape(t *testing.T) {
 		t.Fatalf("unexpected tree folder node: %#v", treeFolder)
 	}
 
-	treeFolderACL := index["projects/project-primary-project/tree/folder-docs/folder.json"]
+	treeFolderACL := index[filepath.ToSlash(filepath.Join("projects", "project-primary-project", "tree", "folder-docs", testFolderFileName))]
 	if treeFolderACL.LogicalType != "hierarchy_folder" || treeFolderACL.FileRole != "folder" {
 		t.Fatalf("unexpected tree folder file classification: %#v", treeFolderACL)
 	}
 
-	treeItem := index["projects/project-primary-project/tree/folder-docs/item-roadmap/item.json"]
+	treeItem := index[filepath.ToSlash(filepath.Join("projects", "project-primary-project", "tree", "folder-docs", "item-roadmap", testItemFileName))]
 	if treeItem.LogicalType != "item" || treeItem.FileRole != "item" {
 		t.Fatalf("unexpected tree item classification: %#v", treeItem)
 	}
@@ -205,12 +268,12 @@ func TestScanRootBuildsProjectedNodesFromBootstrapShape(t *testing.T) {
 		t.Fatalf("expected tree item resource slug roadmap, got %#v", treeItem.ResourceSlug)
 	}
 
-	usersData := index["users/data.json"]
+	usersData := index[filepath.ToSlash(filepath.Join("users", testDataFileName))]
 	if usersData.LogicalType != "users" || usersData.FileRole != "data" {
 		t.Fatalf("unexpected users data classification: %#v", usersData)
 	}
 	if usersData.Checksum == "" || usersData.SizeBytes == 0 {
-		t.Fatalf("expected users/data.json checksum and size to be populated: %#v", usersData)
+		t.Fatalf("expected users/%s checksum and size to be populated: %#v", testDataFileName, usersData)
 	}
 }
 
@@ -221,13 +284,32 @@ func mustMkdirAll(t *testing.T, path string) {
 	}
 }
 
-func mustWriteJSON(t *testing.T, path string, payload any) {
+func mustWriteStructured(t *testing.T, path string, payload any) {
 	t.Helper()
-	bytes, err := json.MarshalIndent(payload, "", "  ")
+	var (
-	if err != nil {
+		bytes []byte
-		t.Fatalf("MarshalIndent(%q) error = %v", path, err)
+		err   error
+	)
+	switch filepath.Ext(path) {
+	case ".cbor":
+		bytes, err = cbor.Marshal(payload)
+	case ".json":
+		bytes, err = json.MarshalIndent(payload, "", "  ")
+		if err == nil {
+			bytes = append(bytes, '\n')
+		}
+	case ".jsonc":
+		bytes, err = json.MarshalIndent(payload, "", "  ")
+		if err == nil {
+			bytes = append([]byte("// Fixture JSONC with comments and trailing commas enabled.\n"), bytes...)
+			bytes = append(bytes[:len(bytes)-2], []byte(",\n}\n")...)
+		}
+	default:
+		t.Fatalf("unsupported structured fixture file %q", path)
+	}
+	if err != nil {
+		t.Fatalf("marshal %q error = %v", path, err)
 	}
-	bytes = append(bytes, '\n')
 	if err := os.WriteFile(path, bytes, 0o644); err != nil {
 		t.Fatalf("WriteFile(%q) error = %v", path, err)
 	}

Documentation/POSIX-Structure.md

@@ -1,75 +1,81 @@
 # POSIX Structure
 
-[Filetree Link](https://tree.nathanfriend.com/?s=(%27optiUs!(%27fancy!Yue~fullPath!fbq~YailingSlash!Yue~rootDot!fbq)~R(%27R%27PJ%20or%20OrganizatiU%20%7Bqrver%7DM*46layout6cNlog7packs7*pack37A2*enYies75W5A_standbUe7WA6HwH30LZ2teamw5teamGL5Z6FwF30LKTC058T5C7XFG5LXKXTXC7XI7I05QG5BN2*8QG5BN6Z04_dN_pJw*pJGlayout2L*KI70%27)~vEiU!%271%27)*%20%200M52_*3-%3Cslug%3E4qttings5**69M*7%2F08VG*V259.jsUA5manifestBQ25*schema25*dCchildrenEersFprojectG305HdepartmentI*YeeJEUbKhome2L*42M%5CnNataQitemRsource!Tacl2UonVfolderW*app37X55YtrZusE_90balqsews0%01wqb_ZYXWVUTRQNMLKJIHGFECBA987654320*)
+Note: regenerate the external filetree link if you want the hosted visual tree to reflect the new `.cbor` and `.jsonc` paths.
 
 ``` markdown
 Personal or Organization (server)/
-├── settings.json
+├── settings.cbor
-├── layout.json
 ├── catalog/
 │   ├── packs/
 │   │   └── pack-<slug>/
-│   │       ├── manifest.json
+│   │       ├── manifest.jsonc
 │   │       └── entries/
 │   │           └── app-<slug>/
-│   │               └── manifest.json
+│   │               └── manifest.jsonc
 │   └── standalone/
 │       └── app-<slug>/
-│           └── manifest.json
+│           └── manifest.jsonc
 ├── departments/
 │   └── department-<slug>/
-│       ├── settings.json
+│       ├── settings.cbor
-│       ├── users.json
+│       ├── users.cbor
 │       └── teams/
 │           └── team-<slug>/
-│               ├── settings.json
+│               ├── settings.cbor
-│               └── users.json
+│               └── users.cbor
 ├── projects/
 │   └── project-<slug>/
-│       ├── settings.json
+│       ├── settings.cbor
-│       ├── home.json
+│       ├── home.cbor
-│       ├── acl.json
+│       ├── acl.cbor
 │       ├── children/
 │       │   └── folder-<slug>/
-│       │       ├── folder.json
+│       │       ├── folder.cbor
-│       │       ├── acl.json
+│       │       ├── acl.cbor
 │       │       └── children/
 │       │           └── project-<slug>/
-│       │               ├── settings.json
+│       │               ├── settings.cbor
-│       │               ├── home.json
+│       │               ├── home.cbor
-│       │               ├── acl.json
+│       │               ├── acl.cbor
 │       │               ├── children/
 │       │               └── tree/
 │       └── tree/
 │           ├── item-<slug>/
-│           │   ├── item.json
+│           │   ├── item.cbor
 │           │   ├── schema.json
-│           │   └── data.json
+│           │   └── data.cbor
 │           └── folder-<slug>/
-│               ├── folder.json
+│               ├── folder.cbor
 │               └── item-<slug>/
-│                   ├── item.json
+│                   ├── item.cbor
 │                   ├── schema.json
-│                   └── data.json
+│                   └── data.cbor
 └── users/
-    ├── settings.json
+    ├── settings.cbor
-    ├── data.json
+    ├── data.cbor
     └── personals/
         └── personal-<slug>/
-            ├── layout.json
+            ├── layout.cbor
-            ├── settings.json
+            ├── settings.cbor
-            ├── home.json
+            ├── home.cbor
             └── tree/
 ```
 
 ## File Responsibilities
 
-- `settings.json` — Metadata and presentation config for the thing, such as display name, icon, description, and simple settings.
+- `settings.cbor` — Machine-owned metadata and presentation config for the thing, such as display name, icon, description, and simple settings.
-- `layout.json` — Layout configuration for the current server or personal space.
+- `layout.cbor` — Machine-owned layout configuration for the current server or personal space.
-- `home.json` — Home surface configuration, such as widgets, sections, and how they are arranged.
+- `home.cbor` — Machine-owned home surface configuration, such as widgets, sections, and how they are arranged.
-- `folder.json` — Metadata for a folder node in a tree.
+- `folder.cbor` — Machine-owned metadata for a folder node in a tree.
-- `item.json` — Instance metadata for a created item, including what it is and how it should behave.
+- `item.cbor` — Machine-owned instance metadata for a created item, including what it is and how it should behave.
 - `schema.json` — The structure expected by that item's data.
-- `data.json` — The actual content or state data for that item.
+- `data.cbor` — The machine-owned content or state data for that item.
-- `manifest.json` — Catalog definition metadata, including versioning, description, and capabilities for reusable apps or entries.
+- `manifest.jsonc` — Human-facing catalog definition metadata, including versioning, description, capabilities, and comments for reusable apps or entries.
-- `users.json` — User membership or assignment data for departments and teams.
+- `users.cbor` — Machine-owned user membership or assignment data for departments and teams.
+- `acl.cbor` — Machine-owned access control data for projects and folders.
+
+## Format Rules
+
+- Use `*.jsonc` for catalog manifests that may be authored or reviewed by humans.
+- Use `*.cbor` for machine-owned POSIX state and metadata files where parse speed, compactness, and backupability matter more than direct editability.
+- Keep `schema.json` as JSON so it remains compatible with JSON Schema tooling and validation flows.

Documentation/TODO.md

@@ -63,11 +63,11 @@
 - [ ] POSIX-Lite-File-Persistence-Foundation
   - [ ] Mounted-Storage-Root-Config
   - [ ] Project-Folder-Creation-On-Backend
-  - [ ] moku.project.json
+  - [ ] manifest.jsonc
   - [ ] Item-Folder-Creation
-  - [ ] item.json
+  - [ ] item.cbor
   - [ ] schema.json
-  - [ ] data.json
+  - [ ] data.cbor
   - [ ] DB-To-Files-Write-Flow
 - [ ] User-and-Workspace-Domain-Readiness
   - [ ] Base-Workspace