chore: repo scaffolding — gitignore and .claude settings

Ignore the Walkers symlink (live game saves), snapshots/, the large
regenerable il2cpp/ dumps, and Python cruft. Carry over the project
permission allowlist in .claude/settings.local.json.

.gitignore

@@ -0,0 +1,33 @@
+# Symlink to game data / old claude stuff
+/Walkers
+Walkers/
+
+# Snapshots
+/snapshots/
+snapshots/
+
+# Huge IL2CPP / GameAssembly dumps (regenerable, ~460MB)
+/il2cpp/
+
+# Python
+__pycache__/
+*.py[cod]
+*$py.class
+*.so
+.Python
+venv/
+.venv/
+env/
+ENV/
+build/
+dist/
+*.egg-info/
+.eggs/
+.pytest_cache/
+.mypy_cache/
+.ruff_cache/
+.ipynb_checkpoints/
+
+# Environment
+.env
+.env.*