diff --git a/docs/release-control/v6/internal/subsystems/deployment-installability.md b/docs/release-control/v6/internal/subsystems/deployment-installability.md
index f8ebb2521..ce2f2b94b 100644
--- a/docs/release-control/v6/internal/subsystems/deployment-installability.md
+++ b/docs/release-control/v6/internal/subsystems/deployment-installability.md
@@ -37,6 +37,9 @@ server-side update execution surfaces.
 15. `scripts/dev-check.sh`
 16. `scripts/toggle-mock.sh`
 17. `scripts/clean-mock-alerts.sh`
+18. `scripts/dev-launchd-setup.sh`
+19. `scripts/dev-launchd-wrapper.sh`
+20. `scripts/com.pulse.hot-dev.plist.template`
 
 ## Shared Boundaries
 
@@ -51,7 +54,7 @@ server-side update execution surfaces.
 2. Add or change release-build metadata injection, release artifact assembly, or governed promotion metadata resolution through `scripts/build-release.sh`, `scripts/release_ldflags.sh`, and `scripts/release_control/resolve_release_promotion.py`, plus the container Dockerfile and governed release workflows that consume those same contracts
 3. Add or change shell installer, Windows installer, container-agent installer, or auto-update script behavior through `scripts/install.sh`, `scripts/install.ps1`, `scripts/install-container-agent.sh`, and `scripts/pulse-auto-update.sh`
 4. Add or change server update transport through `internal/api/updates.go` and `frontend-modern/src/api/updates.ts`
-5. Add or change local dev-runtime orchestration, managed ownership, browser-runtime proof wiring, frontend/backend coherence diagnostics, canonical developer entry wrappers, or dev-runtime helper control surfaces through `scripts/hot-dev.sh`, `scripts/hot-dev-bg.sh`, `tests/integration/scripts/managed-dev-runtime.mjs`, `package.json`, `frontend-modern/package.json`, `scripts/dev-check.sh`, `scripts/toggle-mock.sh`, and `scripts/clean-mock-alerts.sh`
+5. Add or change local dev-runtime orchestration, managed ownership, browser-runtime proof wiring, frontend/backend coherence diagnostics, canonical developer entry wrappers, or dev-runtime helper control surfaces through `scripts/hot-dev.sh`, `scripts/hot-dev-bg.sh`, `tests/integration/scripts/managed-dev-runtime.mjs`, `package.json`, `frontend-modern/package.json`, `scripts/dev-check.sh`, `scripts/toggle-mock.sh`, `scripts/clean-mock-alerts.sh`, `scripts/dev-launchd-setup.sh`, `scripts/dev-launchd-wrapper.sh`, and `scripts/com.pulse.hot-dev.plist.template`
 
 ## Forbidden Paths
 
@@ -196,6 +199,12 @@ Makefile targets, `scripts/toggle-mock.sh`, and `scripts/clean-mock-alerts.sh` m
 route through the managed runtime control plane when they are operating on the
 local dev stack, instead of resurrecting lane-local `hot-dev.sh` or raw Vite
 process management through separate shell folklore.
+That same rule now extends to the macOS auto-start surface. The launchd helper
+may not boot a separate legacy foreground runtime beside the managed dev stack:
+`scripts/dev-launchd-wrapper.sh`, `scripts/dev-launchd-setup.sh`, and the
+generated `com.pulse.hot-dev` LaunchAgent template must supervise the same
+managed `hot-dev-bg` control plane, so login-time auto-start, crash restart,
+and takeover diagnostics all operate on one runtime model.
 That shared `scripts/install.sh` boundary must also keep one canonical service
 argument builder for the runtime flags it persists. Token-bearing install
 paths, token-file systemd paths, wrapper-script launches, and later service
diff --git a/docs/release-control/v6/internal/subsystems/registry.json b/docs/release-control/v6/internal/subsystems/registry.json
index 04868cb55..75e8aaae2 100644
--- a/docs/release-control/v6/internal/subsystems/registry.json
+++ b/docs/release-control/v6/internal/subsystems/registry.json
@@ -2136,7 +2136,10 @@
         "package.json",
         "scripts/build-release.sh",
         "scripts/clean-mock-alerts.sh",
+        "scripts/com.pulse.hot-dev.plist.template",
         "scripts/dev-check.sh",
+        "scripts/dev-launchd-setup.sh",
+        "scripts/dev-launchd-wrapper.sh",
         "scripts/hot-dev-bg.sh",
         "scripts/hot-dev.sh",
         "scripts/install-container-agent.sh",
@@ -2241,7 +2244,10 @@
               "Makefile",
               "package.json",
               "scripts/clean-mock-alerts.sh",
+              "scripts/com.pulse.hot-dev.plist.template",
               "scripts/dev-check.sh",
+              "scripts/dev-launchd-setup.sh",
+              "scripts/dev-launchd-wrapper.sh",
               "scripts/hot-dev-bg.sh",
               "scripts/hot-dev.sh",
               "scripts/toggle-mock.sh",
diff --git a/scripts/dev-launchd-setup.sh b/scripts/dev-launchd-setup.sh
index dc1293fe1..e4d944210 100755
--- a/scripts/dev-launchd-setup.sh
+++ b/scripts/dev-launchd-setup.sh
@@ -1,5 +1,5 @@
 #!/usr/bin/env bash
-# dev-launchd-setup.sh - Install or uninstall the Pulse dev Launch Agent
+# dev-launchd-setup.sh - Install or uninstall the Pulse managed dev LaunchAgent
 #
 # Usage:
 #   ./scripts/dev-launchd-setup.sh           # Install and start
@@ -89,15 +89,16 @@ install() {
     fi
 
     echo ""
-    log_info "=== Pulse Dev Launch Agent Installed ==="
+    log_info "=== Pulse Dev LaunchAgent Installed ==="
     log_info ""
-    log_info "The dev environment will now auto-start on login and auto-restart on crash."
+    log_info "The managed dev runtime will now auto-start on login and auto-restart on crash."
     log_info ""
     log_info "Useful commands:"
     log_info "  Restart:  launchctl kickstart -k ${GUI_DOMAIN}/${LABEL}"
     log_info "  Stop:     launchctl kill SIGTERM ${GUI_DOMAIN}/${LABEL}"
     log_info "  Status:   launchctl print ${GUI_DOMAIN}/${LABEL}"
     log_info "  Logs:     tail -f ${LOG_DIR}/hot-dev.stderr.log"
+    log_info "  Runtime:  cd ${ROOT_DIR} && ./scripts/hot-dev-bg.sh status"
     log_info "  Disable:  launchctl bootout ${GUI_DOMAIN}/${LABEL}"
     log_info "  Remove:   $0 uninstall"
 }
diff --git a/scripts/dev-launchd-wrapper.sh b/scripts/dev-launchd-wrapper.sh
index 3ffbecff0..c29a3a81f 100755
--- a/scripts/dev-launchd-wrapper.sh
+++ b/scripts/dev-launchd-wrapper.sh
@@ -1,13 +1,14 @@
 #!/usr/bin/env bash
-# dev-launchd-wrapper.sh - Wrapper for running hot-dev.sh under launchd
+# dev-launchd-wrapper.sh - Wrapper for running hot-dev-bg launchd-session
 #
 # launchd doesn't source login profiles, so PATH won't include go, npm,
 # node, fswatch, etc. Hand off to an interactive login zsh so the user's
-# normal shell environment is loaded before exec'ing hot-dev.sh.
+# normal shell environment is loaded before exec'ing the managed launchd
+# supervisor path.
 
 set -euo pipefail
 
 SCRIPT_DIR="$(cd "$(dirname "${BASH_SOURCE[0]}")" && pwd -P)"
 export PULSE_DEV_ROOT="$(cd "${SCRIPT_DIR}/.." && pwd -P)"
 
-exec /bin/zsh -ilc 'cd "$PULSE_DEV_ROOT" && exec bash scripts/hot-dev.sh'
+exec /bin/zsh -ilc 'cd "$PULSE_DEV_ROOT" && exec bash scripts/hot-dev-bg.sh launchd-session --takeover'
diff --git a/scripts/hot-dev-bg.sh b/scripts/hot-dev-bg.sh
index e31509996..89ee6020e 100755
--- a/scripts/hot-dev-bg.sh
+++ b/scripts/hot-dev-bg.sh
@@ -7,6 +7,7 @@
 #   ./scripts/hot-dev-bg.sh stop
 #   ./scripts/hot-dev-bg.sh restart
 #   ./scripts/hot-dev-bg.sh backend-restart
+#   ./scripts/hot-dev-bg.sh launchd-session [--takeover]
 #   ./scripts/hot-dev-bg.sh verify [--takeover]
 #   ./scripts/hot-dev-bg.sh status
 #   ./scripts/hot-dev-bg.sh logs
@@ -669,6 +670,56 @@ verify_bg() {
   run_verify_proof_command
 }
 
+launchd_session_bg() {
+  local takeover="${1:-false}"
+  local managed_pid poll_interval
+
+  require_python
+
+  stop_and_exit() {
+    log "Launchd supervisor received termination signal; stopping managed runtime..."
+    stop_bg
+    exit 0
+  }
+
+  trap stop_and_exit TERM INT HUP
+
+  if ! is_running; then
+    log "Managed runtime is not running. Starting supervised session..."
+    start_bg "${takeover}"
+  else
+    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"
+      fi
+      log "Managed runtime has split ownership. Reclaiming ports before launchd supervision..."
+      stop_bg
+      start_bg "${takeover}"
+    elif ! runtime_healthy; then
+      log "Managed runtime is unhealthy. Restarting it before launchd supervision..."
+      stop_bg
+      start_bg "${takeover}"
+    fi
+  fi
+
+  managed_pid="$(managed_session_pid)"
+  [[ -n "${managed_pid}" ]] || fail "Managed runtime did not produce a session pid"
+
+  poll_interval="${HOT_DEV_BG_SUPERVISOR_POLL_INTERVAL:-1}"
+  log "Supervising managed runtime for launchd (pid: ${managed_pid})"
+
+  while is_running; do
+    sleep "${poll_interval}"
+  done
+
+  rm -f "${PID_FILE}"
+  log "Managed runtime exited unexpectedly under launchd supervision"
+  touch "${LOG_FILE}"
+  tail -n 80 "${LOG_FILE}" || true
+  return 1
+}
+
 usage() {
   cat <<EOF
 Usage: $(basename "$0") <command>
@@ -678,6 +729,7 @@ Commands:
   stop
   restart
   backend-restart
+  launchd-session [--takeover]
   verify [--takeover]
   status
   logs
@@ -689,7 +741,7 @@ parse_takeover_flag() {
   local flag="${2:-}"
 
   case "${command}" in
-    start|restart|verify)
+    start|restart|verify|launchd-session)
       if [[ -z "${flag}" ]]; then
         printf "false\n"
         return 0
@@ -731,6 +783,7 @@ main() {
       start_bg "${takeover}"
       ;;
     backend-restart) restart_backend_bg ;;
+    launchd-session) launchd_session_bg "${takeover}" ;;
     verify) verify_bg "${takeover}" ;;
     status) status_bg ;;
     logs) logs_bg ;;
diff --git a/scripts/tests/test-hot-dev-bg.sh b/scripts/tests/test-hot-dev-bg.sh
index e61640526..06d00160f 100755
--- a/scripts/tests/test-hot-dev-bg.sh
+++ b/scripts/tests/test-hot-dev-bg.sh
@@ -8,6 +8,7 @@ ROOT_DIR="$(cd "$(dirname "${BASH_SOURCE[0]}")/../.." && pwd)"
 HOT_DEV_BG="${ROOT_DIR}/scripts/hot-dev-bg.sh"
 PACKAGE_JSON="${ROOT_DIR}/package.json"
 FRONTEND_PACKAGE_JSON="${ROOT_DIR}/frontend-modern/package.json"
+DEV_LAUNCHD_WRAPPER="${ROOT_DIR}/scripts/dev-launchd-wrapper.sh"
 
 if [[ ! -x "${HOT_DEV_BG}" ]]; then
   echo "hot-dev-bg.sh not found or not executable at ${HOT_DEV_BG}" >&2
@@ -106,6 +107,7 @@ test_cli_parses_takeover_flag() {
       printf "start=%s\n" "$(parse_takeover_flag start --takeover)"
       printf "restart=%s\n" "$(parse_takeover_flag restart --takeover)"
       printf "verify=%s\n" "$(parse_takeover_flag verify --takeover)"
+      printf "launchd=%s\n" "$(parse_takeover_flag launchd-session --takeover)"
       printf "backend_restart=%s\n" "$(parse_takeover_flag backend-restart)"
       printf "plain=%s\n" "$(parse_takeover_flag start)"
       if parse_takeover_flag status --takeover >/tmp/hot-dev-bg.invalid 2>&1; then
@@ -119,6 +121,7 @@ test_cli_parses_takeover_flag() {
   assert_contains "takeover parsing enables start" "${output}" "start=true"
   assert_contains "takeover parsing enables restart" "${output}" "restart=true"
   assert_contains "takeover parsing enables verify" "${output}" "verify=true"
+  assert_contains "takeover parsing enables launchd-session" "${output}" "launchd=true"
   assert_contains "backend restart remains flagless" "${output}" "backend_restart=false"
   assert_contains "start without flag stays false" "${output}" "plain=false"
   assert_contains "unexpected status flag is rejected" "${output}" "invalid=rejected"
@@ -145,6 +148,37 @@ PY"
   assert_contains "verify proof defaults password" "${output}" "password=admin"
 }
 
+test_launchd_session_supervises_managed_runtime() {
+  local output
+  output="$(
+    HOT_DEV_BG_PATH="${HOT_DEV_BG}" \
+    bash -lc '
+      source "${HOT_DEV_BG_PATH}"
+      set +e
+      test_dir="$(mktemp -d)"
+      trap "rm -rf \"$test_dir\"" EXIT
+      PID_FILE="${test_dir}/hot-dev-bg.pid"
+      LOG_FILE="${test_dir}/hot-dev-bg.log"
+      require_python(){ :; }
+      start_bg(){ printf "%s\n" "999999" > "${PID_FILE}"; }
+      launchd_session_bg true
+      status=$?
+      printf "status=%s\n" "${status}"
+    '
+  )"
+
+  assert_contains "launchd session starts supervised runtime" "${output}" "Managed runtime is not running. Starting supervised session..."
+  assert_contains "launchd session announces supervision" "${output}" "Supervising managed runtime for launchd"
+  assert_contains "launchd session exits nonzero on child crash" "${output}" "status=1"
+}
+
+test_launchd_wrapper_uses_managed_supervisor() {
+  local output
+  output="$(sed -n '1,80p' "${DEV_LAUNCHD_WRAPPER}")"
+
+  assert_contains "launchd wrapper uses managed launchd-session" "${output}" "scripts/hot-dev-bg.sh launchd-session --takeover"
+}
+
 test_root_package_exposes_managed_runtime_entrypoints() {
   local output
   output="$(
@@ -292,6 +326,8 @@ test_detects_unmanaged_listeners() {
 main() {
   test_cli_parses_takeover_flag
   test_verify_command_injects_managed_runtime_env
+  test_launchd_session_supervises_managed_runtime
+  test_launchd_wrapper_uses_managed_supervisor
   test_root_package_exposes_managed_runtime_entrypoints
   test_frontend_package_exposes_managed_runtime_entrypoints
   test_backend_restart_requires_managed_runtime