Phase A1: bootstrap Python ci_orchestrator package

- pyproject.toml (hatchling) with ruff/mypy/pytest dev deps
- src/ci_orchestrator/: config, credentials, backends (Protocol + WorkstationVmrunBackend), transport (WinRM via pypsrp, SSH via paramiko)
- CLI entry point with PoC 'wait-ready' subcommand (Windows + Linux guests)
- tests/python/: 35 unit tests, 83% coverage, all backends/transport mocked
- gitea/workflows/lint.yml: new 'python' job (ruff + mypy --strict + pytest --cov-fail-under=70)
- config.example.toml + README setup section + .gitignore Python entries

Neutral VmBackend Protocol prepared for Phase C ESXi extension.
See plans/implementation-plan-A-B.md step A1.

src/ci_orchestrator/__init__.py

@@ -0,0 +1,9 @@
+"""Local CI/CD orchestrator package.
+
+Phase A: Python rewrite of the PowerShell-based orchestrator.
+See plans/implementation-plan-A-B.md for the full scope.
+"""
+
+__version__ = "0.1.0"
+
+__all__ = ["__version__"]