DisplayView missed in original M2 refactor — raw onSnapshot(doc(db,path))
survived. In ws/memory mode db is a stub sentinel, so raw SDK calls crash
('Expected first argument to collection() to be a CollectionReference...').
Reported by human testing player display after start combat.
TDD:
1. RED: DisplayView.characterization.test.js asserts adapter.subscribeDoc
called for campaign + encounter + activeDisplay paths. Adapter recorder
(getAdapterCalls/resetAdapterCalls in firebase.js) instruments subscribe
calls — catches raw-SDK bypass that firebase mock alone cannot (mock db
satisfies raw onSnapshot, hiding the bug).
2. Fix: 2 raw onSnapshot sites in DisplayView -> storage.subscribeDoc.
3. GREEN: 2 new tests pass, 116 total green.
Audit confirmed DisplayView was the ONLY remaining raw SDK site in App.js.
david raistrick