v2.2.3

OSS

• fix(customers): CSV re-import updates all fields, UI columns match backend
• chore(deps): quinn-proto 0.11.19 and quinn-udp 0.5.16 (RUSTSEC-2026-0523, 0524, 0538)
• fix(migrations): keep created_at defaults on billing rows for rolling deploys
• feat(billing): billing determinism — a movable clock, charge-keyed line ids, one totals function
• feat(billing): billing safety net — billing-core, rule registry, invariants, document corpus, invoice model