PyPI release for agentplane-control-plane - #4

Summary

• CI on 3.10–3.12 plus a Trusted Publishing release workflow (OIDC, no API tokens).
• Package metadata, changelog, and `RELEASING.md` matching Chronicle/TokenOps.
• Wheel includes the HTML UI and default governance YAML so `pip install` is enough to serve.

One-time (you)

1. PyPI → Publishing → pending GitHub publisher: project `agentplane-control-plane`, owner `theagentplane`, repo `control-plane`, workflow `release.yml`, environment `pypi`.
2. GitHub environment `pypi` is already created on this repo.
3. After merge: Actions → Release → Run workflow on `main` to publish 0.1.0.

Test plan

• CI green on this PR
• `python -m build` produces a wheel with `control_plane/web/` and `control_plane/default.yaml`
• After merge + first release: `pip install agentplane-control-plane && control-plane serve`

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