Broaden gitignore for Cython outputs and local session files

Replace the three explicit Cython-generated paths with src/**/*.c so
new .pyx files anywhere under src/ are automatically covered (the
recent bots/heuristic_cy.pyx surfaced this gap; its generated
heuristic_cy.c was showing up as untracked).

Also ignore .compute.lock (local flock file used by training/benchmarks
to coordinate GPU access) and .claude/ (Claude Code session metadata
directory). Both are local-only artifacts and should never be checked
in.

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

.gitignore

@@ -9,10 +9,12 @@ wheels/
 runs/
 /runs
 
-# Cython-generated sources
+# Cython-generated sources (auto-generated from .pyx anywhere under src/)
-src/coolrl_lost_cities/games/classic/game.c
+src/**/*.c
-src/coolrl_lost_cities/games/classic/engines/fast.c
+
-src/coolrl_lost_cities/games/classic/deep_cfr/*.c
+# Local session / lock files
+.compute.lock
+.claude/
 
 # Rust build output
 target/