feat: Add remote sync for project clones

Fetch remote changes before agents start working so they build on
up-to-date code. Adds ProjectSyncManager with git fetch + ff-only
merge of defaultBranch, integrated into phase dispatch to sync
before branch creation.

- Schema: lastFetchedAt column on projects table (migration 0029)
- Events: project:synced, project:sync_failed
- Phase dispatch: sync all linked projects before creating branches
- tRPC: syncProject, syncAllProjects, getProjectSyncStatus
- CLI: cw project sync [name] --all, cw project status [name]
- Frontend: sync button + ahead/behind badge on projects settings

apps/server/container.ts

@@ -48,6 +48,7 @@ import { DefaultPhaseDispatchManager } from './dispatch/phase-manager.js';
 import type { DispatchManager, PhaseDispatchManager } from './dispatch/types.js';
 import { SimpleGitBranchManager } from './git/simple-git-branch-manager.js';
 import type { BranchManager } from './git/branch-manager.js';
+import { ProjectSyncManager } from './git/remote-sync.js';
 import { ExecutionOrchestrator } from './execution/orchestrator.js';
 import { DefaultConflictResolutionService } from './coordination/conflict-resolution-service.js';
 import { PreviewManager } from './preview/index.js';
@@ -118,6 +119,7 @@ export interface Container extends Repositories {
   dispatchManager: DispatchManager;
   phaseDispatchManager: PhaseDispatchManager;
   branchManager: BranchManager;
+  projectSyncManager: ProjectSyncManager;
   executionOrchestrator: ExecutionOrchestrator;
   previewManager: PreviewManager;
 
@@ -192,6 +194,14 @@ export async function createContainer(options?: ContainerOptions): Promise<Conta
   const branchManager = new SimpleGitBranchManager();
   log.info('branch manager created');
 
+  // Project sync manager
+  const projectSyncManager = new ProjectSyncManager(
+    repos.projectRepository,
+    workspaceRoot,
+    eventBus,
+  );
+  log.info('project sync manager created');
+
   // Dispatch managers
   const dispatchManager = new DefaultDispatchManager(
     repos.taskRepository,
@@ -212,6 +222,7 @@ export async function createContainer(options?: ContainerOptions): Promise<Conta
     repos.projectRepository,
     branchManager,
     workspaceRoot,
+    projectSyncManager,
   );
   log.info('dispatch managers created');
 
@@ -258,6 +269,7 @@ export async function createContainer(options?: ContainerOptions): Promise<Conta
     dispatchManager,
     phaseDispatchManager,
     branchManager,
+    projectSyncManager,
     executionOrchestrator,
     previewManager,
     ...repos,
@@ -269,6 +281,7 @@ export async function createContainer(options?: ContainerOptions): Promise<Conta
         dispatchManager,
         phaseDispatchManager,
         branchManager,
+        projectSyncManager,
         executionOrchestrator,
         previewManager,
         workspaceRoot,