Add legacy rollout migration to paginated history - #37175
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## What changed - Add `LocalThreadStore::migrate_rollouts` with dry-run and apply modes, optional thread selection, throughput limiting, and per-rollout outcomes. - Canonicalize legacy JSONL records into paginated history while preserving model-visible conversation context, including compressed rollouts and copied fork history. - Publish replacements atomically and journal migrations so interrupted SQLite projections can be recovered. Coordinate migration with rollout compression and skip rollouts with active writers. - Make paginated history a one-way SQLite promotion so stale metadata cannot downgrade a migrated thread. ## Testing - Cover legacy record normalization, dry runs, idempotency, malformed input, compressed rollouts, active writers, interrupted migration recovery, and a cold app-server resume after migration. GitOrigin-RevId: b9991b659f28ebb52da39ce62e8b4e0bae2ba2bb
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Add legacy rollout migration to paginated history
What changed
LocalThreadStore::migrate_rolloutswith dry-run and apply modes,optional thread selection, throughput limiting, and per-rollout outcomes.
model-visible conversation context, including compressed rollouts and copied
fork history.
projections can be recovered. Coordinate migration with rollout compression
and skip rollouts with active writers.
downgrade a migrated thread.
Testing
compressed rollouts, active writers, interrupted migration recovery, and a
cold app-server resume after migration.