The sweep ran once at startup and was never retried: a boot where
store::connect or the roster read failed (e.g. the controller up
before bao) left the tokens live until the next restart. It now runs
off forge::agent_token::spawn's five-minute mint pass, reusing that
pass's roster observation instead of a second store/roster read, so a
failed first tick retries on the next one. Idempotent, so a re-run
after a partial sweep deletes nothing extra. Drops the one-shot
startup spawn; one call path.
Also updates the forge.md and agent_token.rs docs that still said the
legacy hyperhive-<seconds> tokens stay until manually removed.
Refs #4644
e9206505d4