fix(profiles): detect systemd-managed gateways in profile list/show

[Zyrixtrex]

Summary

hermes profile list and hermes profile show <name> could report Gateway: stopped
even when the gateway was actually running as a systemd-managed service.

This happened because profile status checks only looked at gateway.pid.
For host-side systemd setups, that could miss a live gateway that other Hermes
surfaces already detected correctly.

What changed

• Extend hermes_cli.gateway service-name/unit-path helpers to accept an explicit hermes_home
• Update hermes_cli.profiles._check_gateway_running() to:
  • keep the existing gateway.pid check first
  • fall back to systemd service status when no PID-backed gateway is found
• Add regression coverage for:
  • default profile with active systemd user service
  • named profile with profile-scoped service name
  • installed but inactive service remaining False

Reproduction

1. Run Hermes Gateway as a systemd user service
2. Confirm hermes gateway status reports it as running
3. Run hermes profile list or hermes profile show default

Before this change:

• profile surfaces could incorrectly show Gateway: stopped

After this change:

• profile surfaces correctly report the gateway as running

Files changed

• hermes_cli/gateway.py
• hermes_cli/profiles.py
• tests/hermes_cli/test_profiles.py

How to test

uv run pytest tests/hermes_cli/test_profiles.py -q -n0

110 passed

[alt-glitch]

Competing with #20488 — both fix hermes profile list/show missing systemd-managed gateways (closes #20254). Both modify hermes_cli/profiles.py and tests/hermes_cli/test_profiles.py; this PR additionally updates hermes_cli/gateway.py helpers. One should be closed in favor of the other.

[teknium1]

Thanks for addressing the profile-status/systemd mismatch. The premise remains live on current main: hermes_cli/profiles.py:699-729 has PID and runtime-state checks but no systemd service-status fallback, and the #20254 discussion documents why the runtime-state path still misses bare systemd hermes processes.

Problems

• Current main added a profile-scoped runtime-state fallback in hermes_cli/profiles.py:721-729 after this PR's base. Replacing _check_gateway_running() with the PR version would discard that existing container/launch-service path.
• The new tests should be integrated with the current regression set at tests/hermes_cli/test_profiles.py:1669-1810, which protects live-state, stopped-state, and cross-profile PID-reuse behavior.

Suggested changes

• Salvage the systemd lookup as a third fallback after the current PID and gateway_state.json checks.
• Keep the existing runtime-state tests and add the active/inactive systemd cases to that combined behavior.

Automated hermes-sweeper review.