Wire the app read path to the lib's per-doc reactive subscription so a change made
in ANOTHER session propagates without a reload or local action:
- useNgData subscribes the by-need set via subscribeDocs(allReadDocs, bumpRead) —
one doc_subscribe per NURI, per-doc error isolation (never the ORM fan-out). Any
patch (own write or broker-synced from a remote peer) re-runs readUnion.
- Reactive discovery: watchDiscoveredEvents(relist) subscribes the global index →
a new public event from another session enters the read set (and gets its own sub).
- Loop-safe: the sub effect is keyed on a stable sorted-NURI key (readDocKey); a
fire→bumpRead→read never changes the doc set, so no re-subscribe loop. Identity
switch empties the set → clean unsubscribe → rebuild → re-subscribe (no leak).
- readUnion stays the one-shot tolerant reader; subscriptions only trigger re-reads.
Real 2-browser e2e (e2e-multibrowser.feature): B registers → A's EventDetailScreen
shows participantCount 1→2 and an 'unknown' participant WITHOUT A reloading, via A's
doc_subscribe on the public event doc (event-driven). Isolated run 12/12 green.
Count mechanism unchanged (P4/Option-B is next); the joiner still writes the public
event doc's participantCount — which is exactly what the observer sees change live.
Gates: @data auth 4/4, @data isolation 4/4, build + tsc clean.
Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
Sylvain Duchesne
4e96659bd7