PETRA 1.0 compatibility matrix

The former hand-maintained compatibility matrix is retired. The single authoritative candidate record is the schema-v4 PETRA release lock in the Infrastructure repository.

That lock binds the selected source revisions, Common contract revision, published rack images, Gateway and Node artifacts, and signed Android APK. Validate it with Infrastructure's bin/release-lock.py; do not copy those identities into a second matrix here.

This page remains at the historical URL so older component READMEs lead to the canonical record instead of a missing page. Their link text can be updated after the current locked candidate has completed runout, without moving its selected source revisions.