- lib/services/route53-factory.ts: isRoute53Configured() / getRoute53Client()
/ resetRoute53Client(), following the veeam-factory.ts singleton shape
- No explicit credentials option passed to Route53Client — relies on the AWS
SDK's default credential chain reading AWS_ACCESS_KEY_ID/AWS_SECRET_ACCESS_KEY
from process.env, exactly how BWS injects them at the container entrypoint
- CLAUDE.md: document the AWS_* env-prefix exception in the integration table
- All 7 route53-factory.test.ts assertions pass; npx tsc --noEmit clean
