A stand-in vault reloads a nats-server's users as the grants part's list is loaded, and the engine's own rotation code runs
against it with real test-dials and a real confirmation request: at every step at least one login authenticates; the engine
switches only once the list holds both logins and confirms in the new login's name; at rotation-done the old login is
retired and its value dropped; with the list never loaded the test-dial is refused and the engine never switches; and an
abandon after the switch brings the engine back to the old login before the new value goes (ADR 0583 §2-§6). One integration
test; mesh-host holds seven of fifty. The real vault and the real engine together are proven live on g14 first.
(issue 774, 774/S65)
Claude-Session: https://claude.ai/code/session_01NcbgfJ9Gum47zkFKWRaovL
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