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fix(signals): a guess re-based over a parked question's answer waits for that question (#4559) (#4564)

* fix(signals): a guess re-based over a parked question's answer waits for that question (#4559)

When a question's answer re-bases a keyed guess written while the question
was in flight (#4525), the lane's rows are that answer's. If the question's
transaction is still parked on another async read, the lane revealed those
rows beside the old question (`open: [#2]`). The lane seam now holds such a
lane while the transaction it was re-based over is live and blocked, so the
new question and its answer land together (F-1, D-34 ¶3).

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

* perf(signals): inline the parked-question check in laneSeam (-8 B on optimistic rows)

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

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

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