Single EU region for routing v2 launch

Context

order-routing-v2 needs a launch posture. Multi-region is technically possible but adds 6 weeks and significant operational surface area. Customers split: acme-logistics is US-east; stellar-freight is EU; northwind-supply is US-east.

Decision

Launch in a single EU region (Frankfurt). US customers are routed via cross-region replication for v2; multi-region is phase 2 (Q3 or Q4 depending on demand).

Why

• Devon's on-call rotation overlaps Sydney + London hours — easier to support EU primary.
• Cross-region replication is a known quantity; we've run it for billing for 18 months.
• The 6-week multi-region delay would push the GA past the acme-logistics renewal trigger date.

Consequences

• US-east customers see ~30ms cross-region latency added; still well within the <200ms target.
• Multi-region is on the Q3 strategy doc as a follow-on; not committed yet.