* fix(server): report Claude runtime death instead of sitting idle
When the Claude Code CLI process dies on its own — crash, OOM kill, host
suspend — nothing in the daemon observes it unless a turn happens to be in
flight. The query pump only reports a failure while it is draining a turn, so
an idle agent's stream just ends: the agent stays `idle`, indistinguishable
from a healthy resumable one.
Everything the agent parked inside that process dies with it. Background Bash
shells, `Monitor` watches and workflows all live in the CLI process, so the
completion notification that would have woken the agent back up never arrives.
The work is silently gone and the user finds out much later, if at all.
The stale handles are never dropped either, so writes keep going to a dead
transport for as long as the daemon lives (#2472).
Watch the spawned child at the single seam it is already handed over
(`onChildProcess`). When it exits between turns, drop the dead query/input
handles so the next write spawns a fresh process, and emit `turn_failed` —
the manager already routes a non-foreground `turn_failed` to `error` plus a
timeline entry.
A death mid-turn is left alone. The pump already waits for stderr to flush and
reports the real cause; reporting here first would replace that with a bare
exit code.
Intentional teardown stays quiet. All three sites that retire a process detach
the child handle first: `close()` sets `closed`, and `ensureQuery()` and
`handleMissingResumedConversation()` null `childProcess` before ending stdin.
Fixes#2472
* fix(server): tree-kill the retired process on missing-resume recovery
The missing-resumed-conversation path ends the child's stdin but never
tree-killed it, so MCP children of the retired claude process could outlive
it as orphans. Every other teardown path already does this; do it here too.
Reported by Greptile on #2910.
