feat: soporte projects y vaults en registry

Añade tablas projects y vaults a registry.db con FTS5, modelos Go,
parser de project.md y vault.yaml, CRUD completo en store, hashing
determinista, validación, y soporte en el indexer para escanear
projects/{name}/ con sus apps, analysis y vaults anidados.
Migration 010 crea las tablas, triggers FTS5, y columna project_id
en apps/analysis. El indexer preserva records remotos (repo_url) al
reindexar, igual que apps/analysis.

registry/hash.go

@@ -77,9 +77,28 @@ func ComputeAnalysisHash(a *Analysis) string {
 	return fmt.Sprintf("%x", h.Sum(nil))
 }
 
+// ComputeProjectHash computes a deterministic hash of all content fields of a Project.
+func ComputeProjectHash(p *Project) string {
+	h := sha256.New()
+	fmt.Fprintf(h, "%s|%s|%s",
+		p.ID, p.Name, p.Description)
+	fmt.Fprintf(h, "|%s", marshalStrings(p.Tags))
+	fmt.Fprintf(h, "|%s|%s|%s|%s", p.RepoURL, p.DirPath, p.Documentation, p.Notes)
+	return fmt.Sprintf("%x", h.Sum(nil))
+}
+
+// ComputeVaultHash computes a deterministic hash of all content fields of a Vault.
+func ComputeVaultHash(v *Vault) string {
+	h := sha256.New()
+	fmt.Fprintf(h, "%s|%s|%s|%s|%s|%t",
+		v.ID, v.Name, v.ProjectID, v.Description, v.Path, v.Symlink)
+	fmt.Fprintf(h, "|%s", marshalStrings(v.Tags))
+	return fmt.Sprintf("%x", h.Sum(nil))
+}
+
 // LoadTimestamps reads existing id → {created_at, updated_at, content_hash} from all tables.
 // Called before Purge so we can preserve dates across reindexing.
-func (db *DB) LoadTimestamps() (funcs, types, apps, analysis map[string]timestampRecord, err error) {
+func (db *DB) LoadTimestamps() (funcs, types, apps, analysis, projects, vaults map[string]timestampRecord, err error) {
 	funcs, err = loadTable(db, "functions")
 	if err != nil {
 		return
@@ -93,6 +112,14 @@ func (db *DB) LoadTimestamps() (funcs, types, apps, analysis map[string]timestam
 		return
 	}
 	analysis, err = loadTable(db, "analysis")
+	if err != nil {
+		return
+	}
+	projects, err = loadTable(db, "projects")
+	if err != nil {
+		return
+	}
+	vaults, err = loadTable(db, "vaults")
 	return
 }