step 3: gut store interfaces and models

- interfaces.go: 1449 → 437 lines (13 kernel interfaces from 33)
- models.go: 1137 → 397 lines (17 kernel types from 64)
- Deleted 28 store impl files per dialect (PG + SQLite)
- Deleted 3 model files (git, memory, workspace)
- Deleted 3 store iface files (project, memory, tree_types)
- Rewrote stores.go constructors for both PG and SQLite
- Stores struct: 20 fields (from 40+, includes separate iface stores)

66 files changed, ~19K lines removed.
Build will break — expected, fixed in steps 4-5.

server/store/postgres/stores.go

@@ -11,47 +11,25 @@ import (
 func NewStores(db *sql.DB) store.Stores {
 	SetDB(db)
 	return store.Stores{
-		Providers:      NewProviderStore(),
-		Catalog:        NewCatalogStore(),
-		Personas:       NewPersonaStore(),
-		Policies:       NewPolicyStore(),
-		UserSettings:   NewUserModelSettingsStore(),
 		Users:          NewUserStore(),
 		Teams:          NewTeamStore(),
-		Channels:       NewChannelStore(),
-		Messages:       NewMessageStore(),
 		Audit:          NewAuditStore(),
-		Notes:          NewNoteStore(),
-		NoteLinks:      NewNoteLinkStore(),
 		GlobalConfig:   NewGlobalConfigStore(),
-		Usage:          NewUsageStore(),
-		Pricing:        NewPricingStore(),
-		Files:          NewFileStore(),
-		KnowledgeBases: NewKnowledgeBaseStore(),
 		Groups:         NewGroupStore(),
 		ResourceGrants: NewResourceGrantStore(),
-		Memories:       NewMemoryStore(),
-		Projects:       NewProjectStore(),
 		Notifications:  NewNotificationStore(),
 		NotifPrefs:     NewNotificationPreferenceStore(),
-		Workspaces:     NewWorkspaceStore(),
-		GitCredentials: &GitCredentialStore{},
-		CapOverrides:   NewCapOverrideStore(db),
-		RoutingPolicies: NewRoutingPolicyStore(db),
-		Sessions:        NewSessionStore(),
-		Packages:        NewPackageStore(),
-		Workflows:       NewWorkflowStore(),
-		Tasks:           NewTaskStore(),
-		Presence:        NewPresenceStore(),
-		PersonaGroups:   NewPersonaGroupStore(),
-		Folders:         NewFolderStore(),
-		Health:          NewHealthStore(db),
-		ExtPermissions:  NewExtensionPermissionStore(db),
-		ExtData:         NewExtDataStore(db),
-		Tickets:         NewTicketStore(),
-		RateLimits:      NewRateLimitStore(),
-		Export:          NewExportStore(),
-		Connections:     NewConnectionStore(),
-		Dependencies:    NewDependencyStore(),
+		Sessions:       NewSessionStore(),
+		Presence:       NewPresenceStore(),
+		Health:         NewHealthStore(db),
+		Connections:    NewConnectionStore(),
+		Dependencies:   NewDependencyStore(),
+		Packages:       NewPackageStore(),
+		Workflows:      NewWorkflowStore(),
+		Tasks:          NewTaskStore(),
+		ExtPermissions: NewExtensionPermissionStore(db),
+		ExtData:        NewExtDataStore(db),
+		Tickets:        NewTicketStore(),
+		RateLimits:     NewRateLimitStore(),
 	}
 }