Checkout launch status — tomorrow

• Unit tests: green.
• End-to-end checkout test: failing on payment confirmation timeout.
• Staging smoke test: not run since the last payment-provider change.
• Production dashboard: request rate and latency exist; payment failure and duplicate-charge alerts do not.
• Feature flag: checkout v2 can be disabled without deployment.
• Rollback owner and commands: not documented.
• Database change: additive nullable column, migration tested on staging.
• Support and on-call have not received the launch runbook.