fix(swarm-drill): collect diagnostics when the drill is cut short by SIGTERM

The routine only carried an EXIT trap, so a run terminated by the enclosing
`timeout` in distros.sh:128 left no rescue diagnostics, no playwright reports
and no teardown — the exact case where the artifacts matter most.

Add a TERM trap and make the handler take the status as an argument, so EXIT
keeps using `$?` while TERM passes 143 explicitly. The `_teardown_done` latch
is required because the EXIT trap still fires after the TERM trap; without it
the whole collect-and-teardown block, including its 1500s and 900s timeouts,
would run twice.

This works because GNU timeout signals the whole process group: bash defers a
trap while it waits on a foreground child, so a bare kill to the script PID
alone would not surface it until that child exited. Reproduced under the real
shape (timeout -k): TEARDOWN rc=143, exactly once, after 2.01s.

Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com>

scripts/tests/deploy/swarm/routine/00_one.sh

@@ -63,7 +63,9 @@ if [ -n "${disable:-}" ]; then
 fi
 
 collect_and_teardown() {
-	rc=$?
+	rc=${1:-$?}
+	[ -n "${_teardown_done:-}" ] && return 0
+	_teardown_done=1
 
 	if [ "${rc}" -ne 0 ]; then
 		rescue_dir="${INFINITO_RESCUE_DIAGNOSTICS_BASE}/${INFINITO_DISTRO}/${APP_ID}"
@@ -82,6 +84,7 @@ collect_and_teardown() {
 	return "${rc}"
 }
 trap collect_and_teardown EXIT
+trap 'collect_and_teardown 143' TERM
 
 # shellcheck source=scripts/tests/deploy/utils/filesystem/pick.sh
 . "${REPO_ROOT}/scripts/tests/deploy/utils/filesystem/pick.sh"