Conform source attestation to estate v1 contract

Add honest source attestation contract (#4)

Add typed OpenAPI, MELT, and runtime contracts (#3)

Add 48-surface evidence passports and safe accessible navigation (#2)

chore(sync): mirror backend .py + Dockerfile to Space (hf-sync mirror-app)

sync(space): full build context — fix BUILD_ERROR + register ROE/parity (CTO)