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fix(signals): require initialization for the recompute-side settle walk (#3181 follow-up)

The walk compensates for a preempted LANDING, and a landing means truth
exists. A projection driver whose first flight is superseded before any
commit reaches the observable store leaves STATUS_PENDING while still
STATUS_UNINITIALIZED — waking parked readers there hands them the
projection's initial face: undefined data a read layer promised was
settled. Unguarded reads throw, REACTIVITY_HALTED takes the system down,
and every boundary wedges at loading (the TanStack Query adapter's
first-load shape on rc.5: a stable chained promise rebuilt when the cache
announces, over a projection seeded with an empty root).

Guard extended to require the node initialized. The #3181 pins hold —
their supersede exits initialized with real truth, exactly the case the
walk exists for. Validated against the full adapter suite (352 green with
the guard, 29 red without); a signals-level minimal red repro eluded
clean-shape reconstruction, which is the argument for the integration
gate that runs the adapter suite against workspace-built core.

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

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