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The winit-commit docs claimed "Reactor rejected, no SwapChainPanel hatch" — that was wrong. windows-rs PR #4499 added the SwapChainPanel widget; the client now uses WinUI 3 via windows-reactor. Update CLAUDE.md M4, the bootstrap-doc status banner (reactor integration: pinned git dep, CARGO_WORKSPACE_DIR, App-SDK build.rs, LL-hook stream input), and the docs-site clients page (WinUI 3, launch-and-pick-a-host). Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>