chore: untrack tests/ (keeps local-only, out of release bottle)

Tests stay in your working tree for development but no longer ship in the
git history or the brew bottle. The CI pipeline doesn't run them anyway
(.github/workflows/ci.yml runs test_claude_code_hook.py + verify_*.py at
repo root). Anyone who wants to run them locally can git-clone an
older tag or pull from the v0.9.1-followup branch.

Author: codejunkie99

.gitignore

@@ -10,6 +10,10 @@ __pycache__/
 venv/
 .pytest_cache/
 
+# tests live outside the repo — keep in your local working tree but don't
+# ship them in releases or the brew bottle.
+tests/
+
 # editor
 .DS_Store
 .idea/