Record CI cache mitigation results and ignore runner logs

- Mark cache-timeout fix verified (run 1090: zero CacheService lines,
  54/54 tests, job succeeded)
- Ignore .gitea/logs/ (runner writes logs into the checkout)
- Leave collaborator's radio-easter-egg changes in the working tree
  (strings.en.json, game_manager.gd) uncommitted for review

DONE.md

@@ -156,6 +156,15 @@ Completed task sections moved from `TODO.md`. Sections are moved only when every
 - [x] Add a `V` control that cycles Hollywood Blvd → The Joke Shop → TV Studio and restarts the
   shift (`GameManager._cycle_venue`), with a `hud.venue_switched` string entry.
 
+## CI — cache timeout mitigation
+
+- [x] Remove `actions/cache@v4` from the checks job (runner cannot reach GitHub's cache
+  service; ~2 min of retry timeouts per run; Godot import is fast without it).
+- [x] Add `GODOT_SILENCE_ROOT_WARNING=1` to both jobs.
+- [x] Confirmed in run 1090: zero `CacheService` lines, 54/54 tests pass, job succeeds.
+- [x] Document the cache situation and re-enable path in `docs/RELEASING.md`.
+- [x] Ignore runner logs in `.gitignore` (`.gitea/logs/`).
+
 ## Gameplay — Venue door-staff dialogue
 
 - [x] Add `VenueScenario.door_staff_line(context, rng)` picking a seeded-random line from