chore: bootstrap cc-ci loop state

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

.gitignore

@@ -0,0 +1,15 @@
+# local secrets / env — never commit
+.testenv
+*.key
+*.pem
+!docs/**/*.pem
+# python
+__pycache__/
+*.pyc
+.venv/
+.pytest_cache/
+# run-scoped ephemeral state (per §4.4 sidecars)
+runs/
+# nix
+result
+result-*