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Give server createProjection slot memory so pending body reads converge (#3068)

An async projection is never ready at creation-scope read time (its first
yield/resolution is at least a microtask away), so a body-time property
read throws NotReady and the retry re-runs the creation scope. Without
memory that allocated a fresh generator + deferred + serialized promise
per pass — the read could never succeed and the flush loop pinned the
process (0 bytes, 100% CPU, permanent). Owner ids are stable across
retry passes (the ssrScope hydration id contract), so projections now
record their pending proxy by slot on the render context — the #3003
memo mechanism — and re-creations join the in-flight instance instead
of starting a new one. Covers createStore(asyncFn) via its projection
route.

Co-authored-by: Cursor <cursoragent@cursor.com>

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