The push-model client base (session-projection RFC final): ProjectionValueStore
holds key → {value, seq} per session, seeded by the tail page's projections
block and updated by session/projection frames under one rule — higher seq
wins on both paths (stale baseline cannot overwrite a newer frame; replayed
frames cannot regress; an omitting fresh baseline clears = capability absent);
truncate() drops phantom rows past a subscribed durable baseline. Per-key
identity-stable faces (always defined; absence is an undefined snapshot) feed
useProjection; the renderer contract's projections member becomes faceOf.
12 store specs cover both seq directions, absence, truncation, and batching.
React half of the session-projection client base: the renderer contract gains
an open-key projections face on SessionMaybeProvideInfo (cellOf(key), distinct
from the static hooks roster), web-react mints projectionHook (per-bundle cache;
per-cell uSES binding via the shared observableHook cache; unresolved keys read
undefined through the absent source so hook order stays constant), standardKit
delivers kit.useProjection, and the runtime merges UseProjection into
SessionStandardProps/SessionMaybeStandardProps (overloads mirror useSession).
3 jsdom specs (kit delivery + live re-render, selector over undefined, faceless
bundle = all absent); existing direct-prop-feed specs gain the one-line stub the
new required seat mandates.
imccyu