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fix(signals): an isPending probe wakes a dormant memo outside its window (#4366) (#4381)

An unowned memo left with no reader goes dormant; the next read wakes it
with a recompute. read() ran that wake before dispatching to the verdict
window, so when the read was an isPending()/latest() probe the memo's pass
read its sources through the probe (committed values): NaN after an async
source landed, a stale value after a source recovered from an error. The
window now wakes the memo itself with the window closed, as it already did
for a pull (A31).


Claude-Session: https://claude.ai/code/session_015hPxMkC3jg3Uivh65gvaf2

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

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