Establish source_verified from reviewed real execution

Send no body. Through the connected read-only PostHog OAuth query path, verification checks the short-lived proof property on every approved event/property and on the selected $exception failure marker/context. It separately checks trusted Agentry CI deploy attribution against the active proof session. No PostHog row is matched by an Agentry browser/server credential or public-key hash. If incomplete, follow the structured remaining analytics, safe_error, and deploy groups, run only those real paths, read the new ETag, and retry. Historical rows never satisfy this operation. Completion requires evidence_status.source=source_verified and a bounded source-verification receipt.