Parse and project native catalog pages in one client-owned worker while preserving transport order, bounded display previews, cancellation routing, and joined worker shutdown. Keep complete native control metadata for canonical forks and direct-input checks.
Publish affirmative ephemeral metadata before settling native requests, so helper shutdown cannot lose catalog exclusion while a passive worker refresh is pending. The existing catalog index owns deletion, stale-read fencing, and persistence.
Synchronize worker-backed fixtures without changing deadlines or weakening assertions, and register the standalone synthetic benchmark. Main-baseline comparisons reproduced the PR regressions before repair. Focused worker, catalog, guarded-request, canonical-fork, and SQLite-restart proof plus changed checks passed; independent Codex review is scoped-clean through P2. Exact-head CI is required before landing.
Related: #152035, #151998, #152257.
