Distribution smoke tests (uvx / docker / brew) #62

Summary

Nightly smoke that published artifacts work.

CNA mapping

CNA: smoke-distribution.yml (npm/docker/homebrew jobs).

Acceptance criteria

• Scheduled workflow
• uvx job required; docker/brew as available
• Fails loudly on regression

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

#9