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fix(signals): latest() of a memo born in a lane throws NotReady, not undefined (#4362, #4363, #4376) (#4383)

* fix(signals): latest() of a memo born in a lane throws NotReady instead of undefined (#4362, #4363, #4376)

A memo whose compute reads latest(s) is re-asked as the write's verdict
lane work, so it becomes a lane derivation. While its first pass is in
flight, nothing is in the lane, and laneValueOf/display fell back to the
committed value, which an uninitialized node does not have:

- latest(m)/isPending(m) served undefined and probed it pending (#4363);
- the lane's end committed that undefined as the node's answer and
  cleared STATUS_UNINITIALIZED with the flight still up, which tripped
  the flush loop guard for [latest(m), isPending(m)] (#4362);
- in hydration, m2 = fetchC(1 + latest(m1)) asked fetchC(NaN) instead of
  adopting the streamed answer (#4376).

laneValueOf/display now return NOT_PENDING for such a node, so every
read throws NotReady (A7; A19 exc. 1) and the lane's end leaves the node
in flight.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_015hPxMkC3jg3Uivh65gvaf2

* fix(signals): keep a verdict reader's lane routing and own-error recovery (async-gen #119, #1238)

- verdictValue: read the lane value before routing the reader into the
  verdict lane, so a node born in the lane with nothing in it yet is read
  as any uninitialized node (NotReady) without moving its reader (#1238).
- reruns: a stale reader whose error is its own (thrown by its pass over
  the committed value it was served) re-derives at the landing; only an
  error from an errored source is skipped (#3945). With #4363 no longer
  committing `undefined`, async-gen case 119 reached this stuck error.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_015hPxMkC3jg3Uivh65gvaf2

* chore: re-measure sizes over next @ 40cde2cd, record async-gen improvements

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