Route hot-dev-bg launchd guidance through npm wrapper

docs/release-control/v6/internal/subsystems/deployment-installability.md

@@ -210,9 +210,10 @@ entrypoint for routine startup instead of teaching direct script invocation as
 the primary habit.
 That operator-guidance rule also applies to the managed launcher's recovery and
 diagnostic messages: when `hot-dev-bg` tells users how to start, restart,
-verify, or inspect the routine local dev runtime, it must route them to the
-repo-root `npm run dev`, `npm run dev:verify`, and `npm run dev:logs` wrappers
-instead of teaching direct raw script invocations for those day-to-day flows.
+verify, supervise, or inspect the routine local dev runtime, it must route them
+to the repo-root `npm run dev`, `npm run dev:verify`, and `npm run dev:logs`
+wrappers instead of teaching direct raw script invocations for those day-to-day
+flows.
 That same dev-runtime helper boundary also includes the auxiliary operator
 controls that start, stop, restart, or recover local development. The repo-root
 Makefile targets, `scripts/toggle-mock.sh`, and `scripts/clean-mock-alerts.sh` must

scripts/hot-dev-bg.sh

@@ -692,7 +692,7 @@ launchd_session_bg() {
     managed_pid="$(managed_session_pid)"
     if [[ -n "${managed_pid}" ]] && has_unmanaged_listeners "${managed_pid}"; then
       if [[ "${takeover}" != "true" ]]; then
-        fail "Managed runtime has split ownership. Rerun with: ./scripts/hot-dev-bg.sh launchd-session --takeover"
+        fail "Managed runtime has split ownership. Rerun with: npm run dev"
       fi
       log "Managed runtime has split ownership. Reclaiming ports before launchd supervision..."
       stop_bg

scripts/tests/test-hot-dev-bg.sh

@@ -329,6 +329,7 @@ test_hot_dev_bg_script_advertises_managed_entrypoint() {
   assert_contains "hot-dev-bg still documents direct launcher start" "${output}" "./scripts/hot-dev-bg.sh start [--takeover]"
   assert_contains "hot-dev-bg routes log guidance to managed wrapper" "${output}" "Check logs with: npm run dev:logs"
   assert_contains "hot-dev-bg routes verify guidance to managed wrapper" "${output}" "Rerun with: npm run dev:verify"
+  assert_contains "hot-dev-bg routes launchd supervision guidance to managed wrapper" "${output}" "Rerun with: npm run dev"
 }
 
 test_clean_mock_alerts_prefers_managed_runtime() {