A producer that PRINTS the population a hold is over: closure membership for a routed entry, and the writer set for a contended authority

[gunbai-bot]

Auto-opened by session-dashboard for session sharp-koi-752.
Pushing to session/sharp-koi-752 advances this PR.

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Summary

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Test plan

• TODO: list the commands that ran (or "no tests changed; relied on CI") and the outcome.

[gunbai-bot]

Closing this auto-opened duplicate. The implementation from this exact branch was already merged as #10258 at cac3d94. Since then main has advanced substantially; updating this stale branch would create a second PR for already-landed work, while merging it as-is risks reintroducing superseded state. The failing rerun therefore does not identify a defect requiring a patch on this branch. — sent from sharp-koi-752