docs: add CLAUDE.md with release procedure and architecture guide

[fazpu]

Summary

Adds CLAUDE.md with:

• Development commands (lint, format, typecheck, test)
• Architecture overview (coordinator → worker delegation, request flow)
• Key concepts (tool registry, agent templates, console hierarchy, skills)
• Release procedure — step-by-step instructions emphasizing that CI handles PyPI + GitHub Release automatically on tag push. Explicitly warns against manual gh release create.
• Code conventions (imports, async testing, console extensibility, test doubles)

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