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>

tests/conftest.py

@@ -0,0 +1,23 @@
+"""Shared pytest fixtures for Cerbero Bite tests."""
+
+from __future__ import annotations
+
+from collections.abc import Iterator
+from pathlib import Path
+
+import pytest
+
+
+@pytest.fixture
+def tmp_data_dir(tmp_path: Path) -> Iterator[Path]:
+    """Isolated data directory with the standard subfolder layout."""
+    data = tmp_path / "data"
+    (data / "log").mkdir(parents=True)
+    (data / "backups").mkdir()
+    yield data
+
+
+@pytest.fixture
+def project_root() -> Path:
+    """Path to the project root (parent of ``src/``)."""
+    return Path(__file__).resolve().parent.parent

tests/unit/test_smoke.py

@@ -0,0 +1,55 @@
+"""Smoke tests: package importable, version exposed, CLI invokable."""
+
+from __future__ import annotations
+
+from pathlib import Path
+
+from click.testing import CliRunner
+
+import cerbero_bite
+from cerbero_bite import __version__
+from cerbero_bite.cli import main as cli_main
+
+
+def test_package_version_string() -> None:
+    assert isinstance(__version__, str)
+    assert __version__.count(".") == 2
+
+
+def test_package_module_attribute() -> None:
+    assert cerbero_bite.__version__ == __version__
+
+
+def test_cli_help_lists_status_command() -> None:
+    runner = CliRunner()
+    result = runner.invoke(cli_main, ["--help"])
+    assert result.exit_code == 0
+    assert "status" in result.output
+
+
+def test_cli_status_runs(tmp_data_dir: Path) -> None:
+    runner = CliRunner()
+    result = runner.invoke(
+        cli_main,
+        ["--log-dir", str(tmp_data_dir / "log"), "status"],
+    )
+    assert result.exit_code == 0
+    assert "Cerbero Bite" in result.output
+    assert "phase: 0" in result.output
+
+
+def test_cli_kill_switch_arm_placeholder(tmp_data_dir: Path) -> None:
+    runner = CliRunner()
+    result = runner.invoke(
+        cli_main,
+        ["--log-dir", str(tmp_data_dir / "log"), "kill-switch", "arm", "--reason", "test"],
+    )
+    assert result.exit_code == 0
+    assert "phase 0 placeholder" in result.output
+
+
+def test_cli_version_flag() -> None:
+    runner = CliRunner()
+    result = runner.invoke(cli_main, ["--version"])
+    assert result.exit_code == 0
+    assert __version__ in result.output