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fix(signals): writes that net in an action's tick pend nothing for a verdict reader (#4485) (#4498)

* fix(signals): writes that net in an action's tick pend nothing for a verdict reader (#4485)

Writes that net to a signal's committed value, made in the tick an action
opens a hold (`setS(2); setS(1)` in the body after `setX(1)`, or on the
mainline just before it), made no proposal (D-8): the seam drops the
staging and nothing is held. A render effect reading `[s(), isPending(s)]`
still showed `[1, true]` for the whole hold and re-ran at the landing as
`[1, false]`. Its plain read took `read`'s verdict-reader `stagedScreen`
arm before the netted check, listing it as a stale reader of the flush's
hold, and its probe was the seam's verdict (`provisionalVerdict`): not
final, routed into the verdict lane with a re-run at the landing.

`read`'s plain arm now checks netting before the `stagedScreen` arm, and
`provisionalVerdict` answers a netted signal staging final: the reader is
still the tick's verdict reader, shown now (D-25), with no re-run at the
landing. The seat table's plain staged rows gain the same netted check
(SLOT_P, nothing raised), which also clears the world mismatches #4452's
netted read left in the shadow (10 classes -> 0).

#4367's opening tick (`act(3)` then a mainline `set(2)` on s = 2) is the
same netted tick, so its interim `pending` frame is re-pinned to the D-8
screen (`F`); its settle after the later writes is unchanged.

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

* chore(size): raise the isPending/latest cap for the netted verdict read

+69 B minified over next on every bundle that imports the verdict engine
(`provisionalVerdict`'s netted arm, and `read`'s plain arm no longer folding
into one ternary). Only "signals: + isPending/latest" crosses its cap:
11.12 -> 11.14 KB at measured 11,130 B + 10 B, recorded minified 30,641 ->
30,725 B. The live... (continued)

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