ui/phase-9: mark stage done after green local-ci run 15

Local-ci run 15 (b4f37d6) finished with status=success: Vitest
17 files / 150 tests, Playwright 64 cases across the four
projects, Go suites for backend/gateway/game/pkg/ui/core all
green.

Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>

ui/PLAN.md

@@ -952,9 +952,9 @@ Targeted tests (delivered):
   invitation removes card and adds the game to My Games. Phase 7
   auth flow now also runs over the FlatBuffers wire.
 
-## Phase 9. Map Renderer with Fixture Data
+## ~~Phase 9. Map Renderer with Fixture Data~~
 
-Status: pending.
+Status: done.
 
 Goal: stand up the PixiJS map renderer with pan/zoom, primitive
 drawing, torus wrap behaviour and bounded-plane (no-wrap) mode against