Fix large inline history handling on MySQL without increasing database limits.
- Recover missing or stale history-budget summaries without sorting payloads or exhausting the regular-expression work limit.
- Read bounded worker history pages by selecting ordered keys before loading payloads.
- Preserve exact history byte counts, first-valid parallel-group fan-out, page order, and task leases.
Validated with native MySQL 8.0.43 defaults, SQLite, PostgreSQL, MariaDB, Laravel 9-13 source upgrades, and a PHP SDK large-payload workflow/activity journey. See #517 for qualification details. Server image follow-through is tracked in #515.