fix: keep macOS gateway launch agent alive after clean exit

[TechwithAlf128]

Summary

• change the generated macOS launchd plist to use KeepAlive=true
• keep the gateway/API server running after clean exits so Open WebUI does not lose the Hermes model backend on port 8642
• update the launchd stop-path comment to match the new behavior

Problem

On macOS, the generated launch agent used KeepAlive = { SuccessfulExit = false; }. If the Hermes gateway exited cleanly, launchd would not restart it. That left the API server on 127.0.0.1:8642 down, which caused browser frontends like Open WebUI to show no available model / "model not selected" until the user manually restarted the gateway.

Verification

• regenerated the launchd plist locally and confirmed it now contains KeepAlive => true
• verified launchd reports the job with keepalive enabled
• verified the Hermes API server remains available on port 8642 and /v1/models returns hermes-agent

[teknium1]

Thanks for the focused macOS gateway fix. This is an automated hermes-sweeper review; current main already provides the requested behavior.

• hermes_cli/gateway.py:3962-3963 generates unconditional <key>KeepAlive</key><true/>.
• tests/hermes_cli/test_gateway_service.py:3552-3571 verifies clean exits restart and rejects the prior SuccessfulExit dict form.
• The equivalent implementation landed in c9b62061d43feb61a3a69caec99148623d988a5e (fix(cli): launchd KeepAlive unconditional restart (#37388)) and shipped in v2026.6.5.

Closing as implemented on main.