per mara's review on #433, move the gating from the dashboard into
the host so a stopped container's stale on-disk state (rate_limited
sentinel, hyperhive-needs-login, last-turn-stats row, status blob)
never reaches the wire in the first place. when build_all sees
is_running == false:
- needs_login → false
- ctx_tokens / context_window_tokens → None
- rate_limited → false
- status_text / status_set_at → None
static / declared fields (extra_links, deployed_sha,
pending_reminders, needs_update, parent) stay populated regardless
of run state.
extend AgentMeta (both AgentResponse + ManagerResponse) with a
`running: bool` field so get_agent_meta callers can tell whether
the target is up — answers the second half of #432 ("agent meta
should probably show the info that it is not running as well").
read_agent_status_live wraps the existing read_agent_status with
the same is_running gate so the manager/agent socket handlers don't
have to know about sentinel semantics.
format_agent_meta now prints a `running: yes|no` line so claude
sees the run state in plain text alongside hyperhive_rev.
frontend follow-up in the same commit: drop the redundant
`c.running &&` guards on ctx_tokens / status_text in
renderContainers — the backend now guarantees those fields are
absent when the container is stopped, so the existing
truthy-check is sufficient. the `■ not running` badge + icon /
links fetch short-circuits stay (those are pure presentation /
network-noise wins the backend can't address).
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