An agent name that is not a valid Ident made `Coordinator::agent_paths`
panic. Job payloads carry names as plain strings (the swarm's published
wanted state is one source), and a panic inside a job-queue node never
reaches `complete_growing`, so the node's resources (the deploy
window included) were held until hive-c0re restarted. `agent_paths` now
returns an error; the job-queue nodes, the admin-socket spawn and
set-limits paths, the root-agent spawn and the dashboard set-limits
handler propagate it.
`lifecycle::list().await.unwrap_or_default()` turned a failed container
list into "no agents":
- meta-update cascade: the lock bump committed and zero rebuilds fanned
out, reported as success. The cascade is now resolved before the lock
bump and a list failure fails the node.
- dashboard update-all: queued nothing and returned 200 "ok". Now 500
with the error.
- container rescan: every row was emitted as removed and the cache
emptied. Now the last snapshot stands; `hivectl status` gets an error.
- dashboard journal: answered 404 "no managed container". Now 500.
- spawn/rebuild port-collision check: silently skipped. Now fails.
- startup migration: the per-agent phases ran over nothing, and phase 3
handed an empty agent list to `meta::sync_agents`, which renders the
meta flake with exactly the agents it is given. Both now log the list
failure and skip.
The hive-jobq scheduler still leaks a node's resources on any executor
panic; that root is not addressed here.
Refs #4723
7ac6819652