feat(p7): moteur git détaillé, API fichiers et watcher FS temps réel

Fondations de la refonte « vrai IDE IA worktree » (chantier P7→P12).

- git.ts : listChanges (status --porcelain=v2 -z + --numstat fusionnés),
  fileDiff (diff unifié borné, refus binaire, untracked via --no-index),
  stage/unstage/restore/clean, commitStaged, amendCommit (refus si poussé),
  fetchRemote, pull (ff-only|rebase), lastCommit, resolveGitDir,
  isSafeRelativePath ; worktreeStatus enrichi (compteurs staged/unstaged/
  conflict + dernier commit), champs additifs WorktreeGitStatus.
- core/fs-watcher.ts : FsWatcherService (chokidar, refcount + pool LRU borné,
  ignore .git sauf HEAD/index, débounce) → invalide factsCache, rediffuse
  worktree_update et émet worktree_changes.
- WorktreeManager : getWorktreeChanges/getFileDiff/stage/unstage/discard/
  fetch/pull/watch/unwatch/assertPathInWorktree ; commitWorktree { mode, amend }.
- routes/git.ts (changes/diff/stage/unstage/discard/fetch/pull) et
  routes/files.ts (GET/PUT contenu fichier, bornage strict au worktree) ;
  fs/list?includeFiles=1 (flag isFile).
- protocole ADDITIF (PROTOCOL_VERSION inchangé) : messages WS watch/unwatch
  (validés dans parseClientMessage) + worktree_changes poussé ciblé par la
  gateway ; front wsClient.watchWorktree + lib/git-api.ts + api.put.
- tests git/fs-watcher/protocole + acceptance-p7.mjs (ALL GREEN).
- dépendance : chokidar (serveur).

packages/server/src/app.ts

@@ -21,9 +21,12 @@ import { registerProjectRoutes } from './routes/projects.js';
 import { registerRepoRoutes } from './routes/repos.js';
 import { registerGroupRoutes } from './routes/groups.js';
 import { registerWorktreeRoutes } from './routes/worktrees.js';
+import { registerGitRoutes } from './routes/git.js';
+import { registerFileRoutes } from './routes/files.js';
 import { registerPushRoutes } from './routes/push.js';
 import { registerSettingsRoutes } from './routes/settings.js';
 import { registerFsRoutes } from './routes/fs.js';
+import { FsWatcherService } from './core/fs-watcher.js';
 import { registerAuditRoutes } from './routes/audit.js';
 import { registerDataRoutes } from './routes/data.js';
 import { registerWsGateway } from './ws/gateway.js';
@@ -74,6 +77,7 @@ export interface AppBundle {
   worktrees: WorktreeManager;
   groups: GroupManager;
   push: PushService;
+  fsWatcher: FsWatcherService;
 }
 
 export function buildApp(config: Config, db: Db, serverVersion: string): AppBundle {
@@ -90,7 +94,10 @@ export function buildApp(config: Config, db: Db, serverVersion: string): AppBund
     projectsDir: config.claudeProjectsDir,
     sessionsDir: config.claudeSessionsDir,
   });
-  const worktrees = new WorktreeManager(db, manager, discovery);
+  // Watcher FS temps réel (P7) : armé à la demande sur les worktrees regardés via les commandes
+  // WS watch/unwatch. closeAll() au drain (libération des descripteurs).
+  const fsWatcher = new FsWatcherService();
+  const worktrees = new WorktreeManager(db, manager, discovery, fsWatcher);
   // Démarré dans runDaemon() (jamais ici) → le scan ne tourne pas pendant les tests qui appellent buildApp.
   const repoDiscovery = new RepoDiscoveryService(db, worktrees);
   const groups = new GroupManager(db);
@@ -175,6 +182,8 @@ export function buildApp(config: Config, db: Db, serverVersion: string): AppBund
   registerRepoRoutes(app, worktrees, db);
   registerGroupRoutes(app, groups, db, worktrees, manager);
   registerWorktreeRoutes(app, worktrees, db);
+  registerGitRoutes(app, worktrees, db);
+  registerFileRoutes(app, worktrees, db);
   registerPushRoutes(app, push, db);
   registerSettingsRoutes(app, db, config, serverVersion, push);
   registerFsRoutes(app);
@@ -198,5 +207,5 @@ export function buildApp(config: Config, db: Db, serverVersion: string): AppBund
     });
   }
 
-  return { app, auth, manager, discovery, repoDiscovery, worktrees, groups, push };
+  return { app, auth, manager, discovery, repoDiscovery, worktrees, groups, push, fsWatcher };
 }