Unify the Godot 4.7.2 CI environment and cache it

Update project features and CI installs/templates to Godot 4.7.2, remove the
old version matrix, and cache the Godot binary and export templates with Gitea
Actions cache. Update release/docs/version references accordingly. Project
import and headless tests pass locally under 4.7.2.

docs/development-status.md

@@ -2,7 +2,7 @@
 
 Implemented so far:
 
-- Godot 4.3 project scaffold, input map, procedural world builder
+- Godot 4.7.2 project scaffold, input map, procedural world builder
 - Venue-driven simulation core: `ShiftCoordinator`, `VenueScenario`, `EventScheduler`, `NPCController` + FSM, `AccessVerifier`, `EscalationManager`, `RadioSystem`, `IncidentRecorder`, `ReputationEvaluator`, `CrowdSystem`
 - Three authored scenarios (Hollywood Boulevard building, The Joke Shop, Late Night TV Studio) with access policies, NPC archetypes, and event pools
 - Headless unit tests: **250 passing** (access rules and venue-correct access loadout, escalation, radio cooldown/battery, NPC reaction determinism, door lock, flashlight perception, persistence round-trip, settings round-trip, input remaps, navmesh, step colliders, skyline alpha, scenario data, full-shift simulation, wand screening, responder dispatch, localization strings, focus cone, action wheel, session shell, PLAN verbs and incident recording, crowd presentation, emergency aftermath, body-camera timeline, NPC theater poses, audio, accessibility, authored scenario content, string formatting, `.tres` venue round-trip, surface materials and environment, focus ranking and outfit/gait helpers, generated prop models, web export preset, prop atlas material, player movement, NPC character layers/LOD/queue, input bindings)
@@ -41,7 +41,7 @@ Implemented so far:
 - Visual alignment: start/venue menu, pause, settings, shift review, radio, wand, inspection, timeline, HUD target chip/escalation bar, and radial menu now use or match their AI references in `assets/images/ui/`. The runtime art loader (`src/game/ui/art.gd`) falls back cleanly when a file is missing.
 - Realism adoption (post-v0.6.0): v2 per-phase skylines and surface tiles with normal maps, retuned sun/exposure/fog, wet asphalt, denser foliage, a visible additive flashlight beam, and refreshed staging captures. `tools/check_screenshots.sh` is the repeatable capture/compare gate; judge is clean of `diff` verdicts.
 - Input/reliability fixes: selecting a venue releases the start-menu input lock and recaptures the mouse; the body-camera overlay no longer covers the shift status. Mouse look now reads at `_input`, restores capture on window focus/click-back, and the HUD is mouse-transparent. Normal radio reports submit on click; emergency calls still require the hold-to-confirm path.
-- Production-quality pass (v0.9.0): mixer/accessibility settings, audio volume clamping, 24-NPC budget smoke, shortened coat/dress stride, and an explicit Godot 4.3-CI/4.7-local support matrix with documented upgrade/rollback requirements.
+- Production-quality pass (v0.9.0): mixer/accessibility settings, audio volume clamping, 24-NPC budget smoke, shortened coat/dress stride, and a unified Godot 4.7.2 CI/local support baseline with documented upgrade/rollback requirements.
 - Campaign and first-hour pass (v0.8.0): campaign progression, checkpoint resume, difficulty presets, a searchable Help overlay, recovery events, contextual dialogue, policy/debrief lines and tutorial/replay/skip. Scripted QA bypasses the tutorial unless `--tutorial` is passed.
 - Tutorial pass (0.8.0 work): the eight-beat first shift is wired through a non-blocking prompt overlay, a safe compliant visitor, real wheel/inspection/warning/radio panels, persisted completion/skip and a Settings replay action. Scripted tests/captures bypass it unless `--tutorial` is passed; `smoke_tutorial.gd` covers the full flow.
 - Vision judge (v0.7.2): discovers the cheapest current OpenRouter image+JSON model, reports the model/fallbacks used, and clears the full screen-design judge (13/13 match, 0 diff).