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fix(signals): first async landing under an optimistic lane — settle invariant, off-lane suspend, untracked isPending probes (#3648) (#3651)

A memo whose FIRST result lands while it is a member of an optimistic lane
takes asyncWrite's lane branch: the value goes into the derived-override
slot (laneOverride), `_value` stays undefined and STATUS_UNINITIALIZED stays
set until the lane's transaction commits and promotes the override.

- settlePendingSource: a displayed derived override is the node's truth for
  the walk; the SETTLE_WALK_UNINITIALIZED_SOURCE invariant no longer fires
  for it (predicate: CONFIG_DERIVED_OVERRIDE && hasActiveOverride). When it
  does fire, the entry is routed through reportDiagnostic with the node as
  subject so the message prints, not only the repair-guide footer.
- overrideRead: an off-lane render reader served the committed frame of a
  node that has never committed throws NotReadyError instead of returning
  `el._value` (a fabricated undefined). readsHeldCommitted already queued
  its re-run at the lane's release.
- isPending: suppressed-probe registration is gated on `tracking` — an
  untracked probe inside a memo no longer enrolls the memo, so the lane wake
  no longer re-runs it (the router query()'s duplicate flight).

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

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