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fix(signals): a write is not held by a hold that waits only on re-asks (#4828) (#4829)

A memo an action's hold had pending only on that action's refresh()
pulled a later, unrelated write into the hold (A15 #3443's propagation
join). The action's guess keeps the hold open until its refresh answers
(A17), so a filter switch between two optimistic stores, the other list's
answer and the switch back all waited, and the refresh's landing showed
the other store's rows under the first filter. A re-ask holds nothing new
(D-34 ¶3): the memo leaves the hold, and its next pass is the write's own
frame. Guess builds only (`guessing`).


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

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

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