SEV-1 kickoff:

At 09:14 UTC, checkout success rate fell from 99.4% to 81.7% immediately after
release `2026.03.13-rc2`. EU traffic is seeing the highest failure rate.
Support has opened 14 enterprise tickets in the last 7 minutes. Payment retries
are increasing and queue depth is rising.

Run this as a live war room. State severity, customer impact, likely blast
radius, the most urgent mitigation path, and assign the first workstream to
each role.
