Tasks: enterprise-react-audio-midi

Phase: 3 of 3 Blocked on: enterprise-react-audio-foundation AND enterprise-react-audio-components shipping green.

Outline (to flesh out at execution time):

src/hooks/use-midi-controller/ — hook with useSyncExternalStore subscription against the controller's connection-state event surface.
src/components/midi-controller-setup/ — <MidiControllerSetup> component with learn-mode UI, target picker, captured-source display, persistence via the foundation's preset store, unbind button.
Add the hook + component to package.json subpath exports (./hooks/use-midi-controller, ./components/midi-controller-setup).
Tests + stories + sibling .md per CLAUDE.md.
5-gate triple + archive + STATUS row flip: at end of Phase 3, description becomes the final post-migration description and status is ✅ (Migrated +1).