feat: refresh shared Git config mounts live

- Use profile-scoped canonical Git clone sources with locked refreshes
- Mount shared Git configuration read-only and isolate profile content
- Add API and desktop/mobile actions for live Git mount refresh

Quality gates: frontend build and backend py_compile passed.
Skipped: backend pytest/Ruff unavailable; Docker/manual checks not approved.

openspec/changes/live-git-config-mount-refresh/tasks.md

@@ -0,0 +1,15 @@
+# Live Git Config Mount Refresh — Tasks
+
+- [x] Add canonical profile-scoped Git clone source planning and clone identity helpers.
+- [x] Make Git Config Profile mounts read-only and prevent profile-content copy into Git sources.
+- [x] Add lock-protected clone/fetch/ref checkout refresh that preserves a known-good checkout on failure.
+- [x] Add save/refresh outcomes for live refresh, restart-required topology, and failures.
+- [x] Add desktop/mobile feedback for refresh outcomes.
+- [ ] Add focused resolver/service/API/frontend tests.
+- [x] Run available verification and document skipped checks.
+
+## Verification Notes
+
+- Passed: frontend production build and Python compilation for changed backend modules.
+- Skipped: backend pytest and Ruff are unavailable in this environment; Docker/manual live-session checks were not approved.
+- Known tooling limitation: project-map patching fails before execution because its runtime sends an unsupported `temperature` parameter.