Env info helper (`--info` equivalent)

[ulises-jeremias]

Summary

Print OS/Python/uv/tooling versions for bug reports.

CNA mapping

CNA: printEnvInfo() via envinfo.

Acceptance criteria

• Callable from CLI --info
• Includes Python, uv, OS, package versions

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

#4