- Add migration 0014_add_session_support.sql (sessions table, session routing)
- Implement renew_session_lock() and cleanup_orphaned_sessions()
- Add session_id to worker_queue and fetch_work_item session routing
- Add 33 session validation tests, 24 session e2e tests
- Sync all e2e_samples from main duroxide repo (28 tests)
- Add per-function migration diff tooling (Python)
- Update prompts with e2e sync step and GitHub references
- Document connection exhaustion under high parallelism
- Bump version to 0.1.20

Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>