Why: Close out the no-project surfaces 404 with unit receipts, CI, merges and 8788 retest. Evidence: Frontend CI runs 4541/4542 and RDM CI runs 4545/4546 success (GATE); 8788 browser retest PASS (SELF). Impact: Task card only. Refs: Frontend #122, RDM #457 Co-authored-by: Cursor <cursoragent@cursor.com>