docs: refresh CLAUDE.md files and open.md to current code state
- Ui CLAUDE.md rewritten around the islands architecture (old
MainWindow/TaskList/StatusBar VMs no longer exist)
- Worker: folder layout (Refine/, Lifecycle/Planning extras), full hub
method/event surface, external MCP tool inventory
- Data: complete GitService operation list incl. commit-range diffs
- App: missing DI registrations; Tests: current test-area overview
- root: project list (Localization, Installer, six test projects) and
honest docs index; plan.md/improvement-plan.md marked historical
- open.md: date bump + visual check for new diff viewer / attention band
Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>
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