来源映射维护备注

HTML section	Maintenance note	Upstream source
architecture	content/architecture.md	P1R real API design section 7
openapi	content/openapi-paths.md	docs/api-contracts/**/openapi.yaml
lifecycle	content/request-lifecycle.md	P1R real API design section 5 and 7
owners	content/domain-owners.md	P1R real API design section 5.3
stages	content/p1r-stages.md	P1R real API design section 10
troubleshooting	content/troubleshooting.md	explainer design section 7.6

维护时先看 upstream source，再同步 HTML；本文件只负责把 HTML 区块、维护备注和上游证据对应起来。