Implementation design brief (grounded in current code): reactive reads via a typed
per-doc doc_subscribe wrapper (no polling, no ORM fan-out -> avoids the historical
hang); participant count via option B (joiner deposits into the event inbox, the
event owner materializes into its own event doc's count; option A ruled out --
non-owner append is impossible in NextGraph). Connection-gated identity (else
'inconnu'). Test plan: polyfill low-level doc_subscribe + real 2-browser e2e
reactivity. Phased P1-P6. Open product question: owner-offline eventual count.
Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
Sylvain Duchesne
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