feat(files): add JIT file sessions and batch sync API (#701)

* feat(files): add JIT file sessions and batch sync API

* feat(app): sync mirrored remote files in desktop sessions

* fix(app): harden base64 encoding for mirror sync

* chore(pr): add remote file sync test evidence

pr/worker-files-jit-sync/cli-test-files.log

@@ -0,0 +1,14 @@
+
+> openwork-orchestrator@0.11.127 test:files /Users/benjaminshafii/openwork-enterprise/_worktrees/openwork-worker-files-jit-sync/packages/orchestrator
+> pnpm build && node scripts/files-session.mjs
+
+
+> openwork-orchestrator@0.11.127 build /Users/benjaminshafii/openwork-enterprise/_worktrees/openwork-worker-files-jit-sync/packages/orchestrator
+> tsc -p tsconfig.json
+
+{
+  "ok": true,
+  "openworkUrl": "http://127.0.0.1:52876",
+  "workspaceId": "ws_9c77bb26ca53",
+  "sessionId": "27effa8d-4958-48e6-a520-9b2fe6f9e1a0"
+}