docs/: BRAND, DISTRIBUTION_SETUP, TROUBLESHOOTING, MIGRATION, ADR uv monorepo

[ulises-jeremias]

Summary

Documentation set mirroring CNA docs + ADR for uv workspaces.

CNA mapping

CNA: docs/BRAND.md, DISTRIBUTION_SETUP.md, TROUBLESHOOTING.md, MIGRATION.md, UIUX_BRANDING_HANDOFF.md.

Acceptance criteria

• Each doc present (can be stubs with TODOs initially)
• ADR explains virtual workspace root choice
• DISTRIBUTION_SETUP lists required secrets for PyPI/Docker/AUR/Brew

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

#8