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fix(signals): a memo's verdict posture follows its readers (#4776, #4778) (#4792)

A sync memo over latest()/isPending() is display while only the display
reads it, and reads held values as the same reads inline do (#4776: the
memo form now shows 2 / 0, as the inline form and a guess do). Once a pass
of a hold's own work reads it (a pass born into the hold, a member of a
frame a held pass built, or an async derivation) it becomes that hold's
work and re-derives at once, served the hold's writes; an async reader also
gets its probe answered in the hold's world, so it asks once, of the truth
(#4778, S-51). One version per node: a memo read by both is the hold's.

core.ts read() stamps the memo with the reading hold (_x._readIn) and
re-runs it; verdict.ts holdStaging requires the stamp, and the two asker
arms treat a stamped memo as an asker (readBy). D-25 gains the rule; the S9
rows of posture-store-parity now pin parity with the inline probe.


Claude-Session: https://claude.ai/code/session_0117BoWNSSgtemsSYsaX2hXE

Co-authored-by: Claude <noreply@anthropic.com>

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