feat: manage workspace Git checkout and snapshots

backend/src/app.ts

@@ -15,6 +15,7 @@ import { settingsRoutes, effectiveSettings } from "./routes/settings.js";
 import { createPiModelLister } from "./pi/list-models.js";
 import { loadSettings, saveSettings, type Settings } from "./settings/settings-store.js";
 import { ReadinessManager } from "./runtime/readiness-manager.js";
+import { WorkspaceRegistry } from "./workspaces/registry.js";
 
 export interface BuildAppDeps {
   thtRunner?: ThtRunner;
@@ -24,6 +25,7 @@ export interface BuildAppDeps {
   getSettings?: (principal?: PrincipalContext) => Settings | Promise<Settings>;
   readiness?: ReadinessManager;
   hub?: SseHub;
+  workspaceRegistry?: WorkspaceRegistry;
 }
 
 export function buildApp(config: AppConfig, deps?: BuildAppDeps): FastifyInstance {
@@ -47,6 +49,10 @@ export function buildApp(config: AppConfig, deps?: BuildAppDeps): FastifyInstanc
   });
   const mgr = deps?.mgr ?? new PiProcessManager(config, deps?.spawnFn ? { spawnFn: deps.spawnFn } : undefined);
   const hub = deps?.hub ?? new SseHub();
+  // Routes are introduced in Task 6; construction here keeps production and injected-test
+  // dependencies on the same registry lifecycle without performing Git I/O at startup.
+  const workspaceRegistry = deps?.workspaceRegistry ?? new WorkspaceRegistry(config.workspaceRegistry);
+  void workspaceRegistry;
   const readiness = deps?.readiness ?? new ReadinessManager(
     tht as ThtRunner,
     Math.round(config.ollamaEnsureTimeoutMs / 1000),