Enforce writer ownership for thread archive and deletion - #35031
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## Why Paginated threads allow only one app-server process to write at a time. Archive and delete operations must not mutate a thread or its spawned descendants while another process owns any of them. ## What changed - Acquire paginated writer locks for the full archive or deletion set before changing rollout files, including descendants whose rollout has not materialized yet. - Add a batch archive store operation so ownership conflicts are detected before any thread in the subtree is archived. - Return ownership conflicts as JSON-RPC invalid-request errors and document the behavior. ## Testing - Cover archive and deletion conflicts for owned threads and descendants, including unmaterialized rollouts. - Verify deletion still removes rollouts with unreadable metadata. GitOrigin-RevId: f62a3e0c1ee2631cea48dd9145b588a1486e2425
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Enforce writer ownership for thread archive and deletion
Why
Paginated threads allow only one app-server process to write at a time. Archive and delete operations must not mutate a thread or its spawned descendants while another process owns any of them.
What changed
Testing