#179 decided that nobody deletes a project on someone else's behalf. The API still let an administrator do it, because the admin store treated every project as its own. Option A from the issue is now in place: opening, editing, snapshots and release stay open to the administrator, deleting stays with the owner. - Store::delete checks the owner under the save lock and throws NotOwnerException for anyone else. It follows the pattern of StaleRevisionException. - The route answers that with 403 "Only its owner may delete a project". A file without an owner is covered the same way. Non-admins still get 404 for a project that is not theirs. - The editor has no way to delete a foreign project, the project picker lists only one's own. Nothing changes there. - An account that owns projects can no longer be deleted by an administrator at all. Its owner has to delete them first. - e2e 49 deleted the throwaway projects as administrator, both in its sweep and in 49i. It now signs in as the owner for that. 49i checks both answers. Tests: - tests/php/accounts.test.php: 56 checks passed (was 52, one check turned around, five new) - e2e 49: 22 checks passed (was 21), deleteByAdmin 403, deleteByOwner 204 - Gate: 197 files, 2855 tests passed - Counter-checks: without the owner check 4 PHP checks and 49i fail - The e2e total of 1603 is computed (1602 + 1), not measured Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>