Release workflow skeleton (tag → GitHub Release)

[ulises-jeremias]

Summary

Decide release-please vs hatch versioning; implement tag/release pipeline skeleton.

CNA mapping

CNA: Changesets + publish.yml on main.

Acceptance criteria

• Documented versioning choice in docs
• Workflow creates releases from main/tags
• Ready to attach PyPI publish job (Epic 8)

Blocked by

none

Blocks

none

Reference

Parity matrix (workspace): knowledge/create-python-app-parity-matrix.md
Reference repo: https://github.com/Create-Node-App/create-node-app

Parent epic

#7