Add rollout migration tooling and background migration - #37348
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## What changed - Add `codex migrate-rollouts` with dry-run inspection by default, explicit `--apply`, thread filtering, optional I/O throttling, progress output, and JSON or verbose reports. - Add the disabled-by-default `background_paginated_rollout_migration` feature to migrate legacy local sessions at startup before rollout compression begins. - Persist a migration cursor and skipped-file fingerprints so later startups avoid full rescans while retrying changed files and recovering pending migrations. - Coordinate migration with live writers and emit metrics for manual and startup runs. ## Testing - Cover startup cursor advancement and lookback, pending migration recovery, live-writer coordination, changed empty rollouts, and progress reporting. GitOrigin-RevId: 276ac506c50ebec5140fd319faca1bb998172061
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Add rollout migration tooling and background migration
What changed
codex migrate-rolloutswith dry-run inspection by default, explicit--apply, thread filtering, optional I/O throttling, progress output, and JSON or verbose reports.background_paginated_rollout_migrationfeature to migrate legacy local sessions at startup before rollout compression begins.Testing