Phase 0: project skeleton

- pyproject.toml with uv, deps for runtime + gui + backtest + dev
- ruff/mypy strict config, pre-commit hooks for ruff/mypy/pytest
- src/cerbero_bite/ layout with empty modules ready for Phase 1+
- structlog JSONL logger with daily rotation
- click CLI with placeholder subcommands (status, start, kill-switch,
  gui, replay, config hash, audit verify)
- 6 smoke tests passing, mypy --strict clean, ruff clean

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

.gitignore

@@ -0,0 +1,45 @@
+# Python
+__pycache__/
+*.py[cod]
+*$py.class
+*.so
+.Python
+build/
+dist/
+*.egg-info/
+.eggs/
+.pytest_cache/
+.coverage
+htmlcov/
+.tox/
+.nox/
+.cache
+.hypothesis/
+.ruff_cache/
+.mypy_cache/
+
+# venv
+.venv/
+venv/
+env/
+
+# uv
+# (uv.lock is checked in; ignore only the venv it creates)
+
+# Editor
+.vscode/
+.idea/
+*.swp
+*.swo
+.DS_Store
+
+# Cerbero Bite — runtime data
+data/
+*.local.yaml
+.lockfile
+.gui-lockfile
+
+# Secrets
+.env
+.env.*
+!.env.example