Ship the 0.9.0 production-quality milestone

Add mixer/accessibility settings, caption/reduce-motion hooks, audio volume
clamping, a 24-NPC performance smoke and shortened coat/dress stride for hem
clipping. Record the explicit Godot 4.3-CI/4.7-local matrix and the 0.9
production scope. Headless 250/250, Python 94/94, 24-NPC budget smoke passes.

README.md

@@ -38,9 +38,8 @@ precision walk, the Joke Shop alley, the TV Studio arrival, and the prop lineup.
 > Downloads are public (no sign-in required) since the host's instance-wide
 > `REQUIRE_SIGNIN_VIEW` was disabled on 2026-10-31.
 >
-> **Latest: v0.8.1** — normal radio reports now send correctly, on top of the
-> v0.8.0 tutorial/campaign/resume pass and the v0.7.x judge, Desktop HQ, venue
-> and gear work.
+> **Latest: v0.9.0** — production-quality audio/accessibility settings, a
+> 24-NPC performance baseline and the v0.8 tutorial/campaign/resume pass.
 > Releases are built automatically when a `vX.Y.Z` tag is pushed
 > (see [`docs/RELEASING.md`](docs/RELEASING.md)); manual builds use
 > `./tools/build_releases.sh`. Installer/AppImage packaging runs in the same pipeline