Full integration of worktree-bridge-cse_01Nnt (54 commits) into main.
Conflicts (17) resolved: adopt branch's p2-65 GameState->mc-state crate move
across mc-ai/mc-core/mc-player-api/mc-turn; keep main's design-token theme
system (build-ui-theme.py, tile_info_panel.gd) and main's newer p0-26b evidence.
Workspace: 2624 tests pass; 5 pre-existing/environmental failures inherited from
main (constructor_smoke capping test, five_players_overflow, 3x gpu_rollout_parity)
— zero regressions introduced by the merge. api-gdext (GDExtension) compiles.
Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>