What does this PR do?

Detects launchd-managed Hermes gateways when handling /restart from the gateway. launchd sets XPC_SERVICE_NAME=ai.hermes.gateway, not INVOCATION_ID, so the previous check only recognized systemd. On macOS this could send /restart down the detached restart path, exit cleanly, and leave launchd configured with KeepAlive SuccessfulExit=false without a respawn.

The fix treats XPC_SERVICE_NAME == "ai.hermes.gateway" as service-managed and uses the existing service restart path (detached=False, via_service=True).

Related Issue

Related to #11932 and the broader launchd restart reliability work, but this is a separate /restart service-detection path.

Type of Change

• 🐛 Bug fix (non-breaking change that fixes an issue)
• ✨ New feature (non-breaking change that adds functionality)
• 🔒 Security fix
• 📝 Documentation update
• ✅ Tests (adding or improving test coverage)
• ♻️ Refactor (no behavior change)
• 🎯 New skill (bundled or hub)

Changes Made

• gateway/run.py
  • Include launchd's XPC_SERVICE_NAME=ai.hermes.gateway in the service-manager detection used by /restart.
  • Clarify the service-supervision comment for both systemd and launchd behavior.
• tests/gateway/test_restart_drain.py
  • Clear XPC_SERVICE_NAME in the non-service restart test.
  • Add launchd coverage verifying /restart calls request_restart(detached=False, via_service=True).

How to Test

1. Run the targeted restart-drain test file:

   python -m pytest tests/gateway/test_restart_drain.py -o 'addopts=' -q

2. Confirm the launchd regression test passes:
   • test_restart_command_under_launchd_uses_service_restart

Checklist

Code

• I've read the Contributing Guide
• My commit messages follow Conventional Commits (fix(scope):, feat(scope):, etc.)
• I searched for existing PRs to make sure this isn't a duplicate
• My PR contains only changes related to this fix/feature (no unrelated commits)
• I've run pytest tests/ -q and all tests pass
• I've added tests for my changes (required for bug fixes, strongly encouraged for features)
• I've tested on my platform: Ubuntu 24.04 / WSL2

Documentation & Housekeeping

• I've updated relevant documentation (README, docs/, docstrings) — or N/A
• I've updated cli-config.yaml.example if I added/changed config keys — or N/A
• I've updated CONTRIBUTING.md or AGENTS.md if I changed architecture or workflows — or N/A
• I've considered cross-platform impact (Windows, macOS) per the compatibility guide — or N/A
• I've updated tool descriptions/schemas if I changed tool behavior — or N/A

Screenshots / Logs

$ python -m pytest tests/gateway/test_restart_drain.py -o 'addopts=' -q
...............                                                          [100%]
15 passed in 1.46s