chore(agent): phase roadmap from TODO.md (179 git clone server freeze)

TODO L3 (a long git clone seems to freeze the server) converted to phase 179:
deterministic in-process repro + verdict, the asyncio.to_thread fix for the
sync's git ops, and the dedicated Playwright E2E suite. TODO.md cleared
(items now live in .agents/phases/).

LLM-Generated: true

TODO.md

@@ -1,3 +1 @@
 # TODO
-
-- [ ] A long git clone seems to freeze the server? Investigate to find out if this is true.