The mara: 'many agents stuck at needs login? seem to do turns fine, no
needs login on agent page. dash shows needs login tho'.
Diagnosed: hive-ag3nt::events::Bus::emit_status writes
{state_dir}/hyperhive-needs-login when status flips to needs_login_idle
and only removes it when status flips to online. But the boot flow only
emits 'online' if the harness was previously parked in wait_for_login —
the LoginState::Online branch went straight into serve() without
touching emit_status. So a sentinel written on a prior boot (e.g. a
401-triggered park) survived a healthy re-spawn, and the dashboard's
auth_failed_sentinel(name) read it as still-needing-login forever after.
Fix: add bus.emit_status('online') at the top of the LoginState::Online
boot branch in both hive-ag3nt.rs (sub-agent) and hive-m1nd.rs (manager).
Idempotent — emit_status is a one-line write/remove on a tiny empty
file; calling it for an already-clean state is a no-op.
This addresses one half of #682. The other half (claude_has_session()
may EACCES on the agent's 0700-perm ~/.claude dir post-#658 root drop)
is c0re-side and tracked separately in the issue thread for damocles.
refs #682