fix(launchd): add ThrottleInterval for faster gateway restart after update

hermes_cli/gateway.py

@@ -1299,7 +1299,15 @@ def generate_launchd_plist() -> str:
         <key>SuccessfulExit</key>
         <false/>
     </dict>
-
+
+    <!-- Cap the restart delay so the gateway recovers quickly after
+         `hermes update` triggers a service restart (exit code {GATEWAY_SERVICE_RESTART_EXIT_CODE}).
+         Without this, launchd's default exponential back-off can delay
+         restarts by minutes when the process exits repeatedly in quick
+         succession (e.g. update → restart → brief crash → restart). -->
+    <key>ThrottleInterval</key>
+    <integer>10</integer>
+
     <key>StandardOutPath</key>
     <string>{log_dir}/gateway.log</string>
 

tests/hermes_cli/test_update_gateway_restart.py

@@ -128,6 +128,25 @@ def test_plist_program_arguments_order(self):
         assert replace_idx == run_idx + 1
 
 
+class TestLaunchdPlistThrottle:
+    """ThrottleInterval must be present so launchd restarts the gateway
+    quickly after ``hermes update`` triggers a service restart."""
+
+    def test_plist_contains_throttle_interval(self):
+        plist = gateway_cli.generate_launchd_plist()
+        assert "<key>ThrottleInterval</key>" in plist
+
+    def test_plist_throttle_interval_is_10_seconds(self):
+        plist = gateway_cli.generate_launchd_plist()
+        lines = [line.strip() for line in plist.splitlines()]
+        for i, line in enumerate(lines):
+            if line == "<key>ThrottleInterval</key>":
+                assert lines[i + 1] == "<integer>10</integer>"
+                break
+        else:
+            raise AssertionError("ThrottleInterval key not found in plist")
+
+
 class TestLaunchdPlistPath:
     def test_plist_contains_environment_variables(self):
         plist = gateway_cli.generate_launchd_plist()