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test(signals): pin #3726 on L2 — derived store sync landing wakes parked readers (supersedes #3732) (#3789)

* test(signals): pin #3726 on L2 — derived store sync landing wakes parked readers

Port of #3732 (brenelz) onto the hold model. The PR patched
`store/next/projection.ts` to retire STATUS_UNINITIALIZED after a
synchronous landing so core's #3181 settle walk would release readers
parked on the superseded first flight: readers whose store node the
landing left unchanged (`"length" in store`, `Object.keys`, an unchanged
`length`) had no value notification to fall back on and stayed blank
inside a loading boundary while a sibling read of the source updated.

On L2 the core already holds, with no store-side patch: a reader of a
derive with a flight up is parked on the derive itself (`pullFamily`
links it, as a reader of a memo with a flight), and the derive's first
commit (uninitialized → a value) is a value change for every subscriber
(`recompute`: `wasUninitialized` → `insertSubs`) — the walk's
uninitialized exemption is moot. The PR's three tests pass unchanged;
its superseded source change is dropped (`src/store/next/` is gone).

Added: the report's sequence verbatim (the source write and the
superseded promise's resolution in one timer callback, under a loading
boundary, microtask-driven) in signals and as a `<Loading>` web spec; a
verdict probe parked on the first flight; and the case the PR listed as
open — a landing a transaction holds: the parked readers re-run as the
transaction's work and reveal at its commit, under a boundary and out
(red on the PR's base with and without its fix; green on L2).

Tests only — no changeset. RULES-INDEX
regenerated (A19/A25/A29 gain the test's citations).

Co-authored-by: Brenley Dueck <brenleydueck@gmail.com>
Co-authored-by: Cursor <cursoragent@cursor.com>

* test(signals): pin GabbeV's board shape from #3726 on L2

The #3726 comment's playground, fetched: an async card source behind a
memo (`createMemo(()... (continued)

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