Add a Continuity and succession section to GOVERNANCE.md (trusted-contact emergency access to credentials enabling continuity within a week). Closes OpenSSF Silver access_continuity.
Add GOVERNANCE.md, MAINTAINERS.md, SUPPORT.md, DCO; add a DCO sign-off requirement to CONTRIBUTING.md and a security assurance case to SECURITY.md. Closes OpenSSF Silver / OSPS Baseline documentation gaps. Additive only.
kingchenc