update python notes with recent projects and uv workspaces
- reference plyr-python-client, pmgfal, prefect-mcp-server-demo, typsht
- add uv workspaces section
- add uv_build as simpler backend option
- mention typsht and prek as alternatives
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Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>