* feat(db): a2a task history module over migration-002 tables
* feat(a2a): persist task lifecycle to a2a_tasks with 30d retention purge
* feat(api): a2a task history listing + historical detail fallback
* feat(dashboard): orchestration History tab (Airflow-grid) over persisted runs (2.2)
* fix(dashboard): assert history preset window + loading and time axis in the grid
* chore(dashboard): history i18n + changelog
* fix(dashboard): explicit history purge cascade + keep live drawer off the History tab
* docs: document OMNIROUTE_A2A_HISTORY_RETENTION_DAYS
* refactor(dashboard): split HistoryTab helpers under the complexity ratchet
---------
Co-authored-by: Markus Hartung <diegosouzapw@users.noreply.github.com>
84b345d9c0