Bump to 0.9.1 and record the toolchain update

README.md

@@ -38,8 +38,9 @@ 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: v0.9.0** — production-quality audio/accessibility settings, a
-> 24-NPC performance baseline and the v0.8 tutorial/campaign/resume pass.
+> **Latest: v0.9.1** — unified Godot 4.7.2 CI/release environment with cached
+> Godot binaries/templates, plus v0.9.0's production-quality and v0.8
+> tutorial/campaign/resume work.
 > 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