cleanup: gitignore __pycache__ + remove accidentally-committed pyc

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

Author: RandomCoder-lab

.gitignore

@@ -44,3 +44,7 @@ omnimcode-gdextension/bin/
 # Local-only WIP examples (not ready for the public repo yet)
 examples/agent-decision-evolution/
 examples/game-ai-demo/Assets/Editor/OMNIcode/
+
+# Python bytecode caches
+**/__pycache__/
+**/*.pyc