Keep what an archive unpacked in the engine's own state directory, never beside the archive, and stop no slower than the host waits (issue 1585, review round 1)

The journal of an unpack sat at <target>.unpacked.json, in a directory
the module's account may write: a forged one would make the root engine
remove or adopt any path it named. It now lives under
<statedir>/unpacked/<sha256 of the target>.json, mode 0600, names its
target, and is refused whole when an entry is not filepath.IsLocal or a
parent is not above the target. It goes when the archive is taken off,
whether its state record still said what it unpacked or not.

The launcher's stop grace for a host on trial rises from 20 s to 75 s and
the unit's TimeoutStopSec is 120 s (openrc the same), past the host's own
60 s wait for the apply in flight, so neither cuts a save off again.

Tests folded as rows into existing ones (the repository is over its unit
budget): the journal's rows, a forged entry and parent refused, the
journal gone with a record that lost its Unpacked; the test that passed
on main dropped; the stop test waits on its own line, not a sleep, and no
longer consumes the save it waits for.

Claude-Session: https://claude.ai/code/session_01JG73KG7AfSdh6FP8VrBqCn

packaging/nox-mesh-host-launch

@@ -38,7 +38,9 @@ BACKOFF="${MESH_HOST_BACKOFF:-5}"
 # How long a host on trial has to report, in seconds: to-be 45 §8's ten minutes from the apply.
 BOUND="${MESH_HOST_TRIAL_BOUND:-600}"
 TICK="${MESH_HOST_TRIAL_TICK:-5}"
-GRACE="${MESH_HOST_STOP_GRACE:-20}"
+# How long a host told to stop is waited for before it is killed, in seconds: past the 60 s the host itself waits for
+# the apply in flight to end and save (novox/hq issue 1585), so a stop never cuts a save off.
+GRACE="${MESH_HOST_STOP_GRACE:-75}"
 ONCE="${MESH_HOST_RUN_ONCE:-}"   # tests run one iteration; nothing else sets this
 
 ATTEMPTS="$STATE_DIR/start-attempts"

packaging/nox-mesh-host.openrc

@@ -5,4 +5,6 @@
 name="nox-mesh-host"
 command="/usr/lib/nox-mesh-host/launch"
 supervisor="supervise-daemon"
+# The same stop bound as the systemd unit's TimeoutStopSec (issue 1585): TERM, 120 s, then KILL.
+retry="TERM/120/KILL/5"
 depend() { need net; }

packaging/nox-mesh-host.service

@@ -12,6 +12,9 @@ Restart=always
 RestartSec=5s
 StateDirectory=mesh-host
 KillMode=mixed
+# Past the launcher's own stop grace (75 s), which is past the 60 s the host waits for the apply in
+# flight to end and save (novox/hq issue 1585): the service manager's kill is the last resort.
+TimeoutStopSec=120
 
 [Install]
 WantedBy=multi-user.target