chore: stop tracking compiled Python bytecode

Two .pyc files under scripts/__pycache__ were committed at some point and have
been churning ever since — merely importing gdl-sync.py to check a config
rewrites them and dirties the tree, which is how they surfaced.

.gitignore had no Python entries at all, only Node ones. The files stay on
disk; this just untracks them.

Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01UXfdJu7QhSJLr47K7koTDF

.gitignore

@@ -9,3 +9,5 @@ coverage/
 !.env.example
 _sample-archives
 _gemini-plans
+__pycache__/
+*.pyc