fix(gateway): address restart review feedback

hermes_cli/gateway.py

@@ -15,8 +15,12 @@ from pathlib import Path
 PROJECT_ROOT = Path(__file__).parent.parent.resolve()
 
 from gateway.status import terminate_pid
+from gateway.restart import (
+    DEFAULT_GATEWAY_RESTART_DRAIN_TIMEOUT,
+    GATEWAY_SERVICE_RESTART_EXIT_CODE,
+    parse_restart_drain_timeout,
+)
 from hermes_cli.config import (
-    DEFAULT_CONFIG,
     get_env_value,
     get_hermes_home,
     is_managed,
@@ -787,7 +791,7 @@ Environment="VIRTUAL_ENV={venv_dir}"
 Environment="HERMES_HOME={hermes_home}"
 Restart=on-failure
 RestartSec=30
-RestartForceExitStatus=75
+RestartForceExitStatus={GATEWAY_SERVICE_RESTART_EXIT_CODE}
 KillMode=mixed
 KillSignal=SIGTERM
 ExecReload=/bin/kill -USR1 $MAINPID
@@ -819,7 +823,7 @@ Environment="VIRTUAL_ENV={venv_dir}"
 Environment="HERMES_HOME={hermes_home}"
 Restart=on-failure
 RestartSec=30
-RestartForceExitStatus=75
+RestartForceExitStatus={GATEWAY_SERVICE_RESTART_EXIT_CODE}
 KillMode=mixed
 KillSignal=SIGTERM
 ExecReload=/bin/kill -USR1 $MAINPID
@@ -932,11 +936,12 @@ def _get_restart_drain_timeout() -> float:
     if not raw:
         cfg = read_raw_config()
         agent_cfg = cfg.get("agent", {}) if isinstance(cfg, dict) else {}
-        raw = str(agent_cfg.get("restart_drain_timeout", DEFAULT_CONFIG["agent"]["restart_drain_timeout"]))
-    try:
-        return max(0.0, float(raw))
-    except (TypeError, ValueError):
-        return float(DEFAULT_CONFIG["agent"]["restart_drain_timeout"])
+        raw = str(
+            agent_cfg.get(
+                "restart_drain_timeout", DEFAULT_GATEWAY_RESTART_DRAIN_TIMEOUT
+            )
+        )
+    return parse_restart_drain_timeout(raw)
 
 
 def systemd_install(force: bool = False, system: bool = False, run_as_user: str | None = None):