Disable unreliable Gitea Godot cache steps

Gitea cache restores were inconsistent and cache saves timed out or were
rejected as reserved by another job. Remove the cache steps and keep direct
4.7.2 downloads; document the evaluation and when to retry. The workflow is
otherwise clean (no .github/ci.yml exists).

MEMORY.md

@@ -63,7 +63,8 @@ Session memory for durable decisions, state, and gotchas. Keep concise, remove o
   Export templates for 4.7.2 are installed under
   `~/.local/share/godot/export_templates/4.7.2.stable`. Godot 4.7 writes
   `*.gd.uid` files; they are kept out of this clone's status via
-  `.git/info/exclude`. CI caches the binary/templates with Gitea Actions cache.
+  `.git/info/exclude`. CI downloads the binary/templates directly; Gitea
+  Actions cache is currently unreliable (see CI cache evaluation below).
 - **Blender invocation (v0.6.0):** `flatpak run org.blender.Blender --background --python
   /run/media/system/DATA/Documents/06-games/security-game/tools/npc_pipeline.py -- build`.
   The flatpak cannot read `/tmp`; use absolute repo paths. `assets/models/npc/.gdignore` is
@@ -576,9 +577,11 @@ Session memory for durable decisions, state, and gotchas. Keep concise, remove o
 - Venue cycling: `V` switches Hollywood Blvd → The Joke Shop → TV Studio and restarts the shift.
 - Venue door-staff dialogue: `VenueScenario.door_staff_line(context, rng)` and GameManager logging
   (id/ticket/wand-check, refusal, prohibited-item) — Joke Shop flavor.
-- CI cache: `.gitea/workflows/build.yml` caches `/usr/local/bin/godot` and the
-  4.7.2 export templates with Gitea Actions cache. `GODOT_SILENCE_ROOT_WARNING=1`
-  is set on jobs.
+- CI cache evaluation: Gitea Actions cache was tested for the Godot binary and
+  trimmed 4.7.2 templates. Restores were inconsistent and saves timed out in
+  `CreateCacheEntry` or were rejected as reserved by another job. The cache steps
+  are disabled until the host cache service is healthy; keep direct downloads.
+  `GODOT_SILENCE_ROOT_WARNING=1` is set on jobs.
   Logs live in `.gitea/logs/` after each run.
 - Visual polish (v0.2.0): phase lighting (GameManager.PHASE_LIGHTING + ProceduralSkyMaterial),
   street lamps + night mode in WorldBuilder.set_night_mode, marquee Label3D, crosswalk/planters/