test: end-to-end plex-watchdog test with live Plex server

[smartwatermelon]

Context

The plex-watchdog BATS tests use XML fixtures for unit testing. An end-to-end test against a live Plex server would catch issues with actual API response format changes, token auth, PUT requests for revert, and real drift detection.

Scope

Design an end-to-end test that:

1. Reads a real Plex setting
2. Changes it via the API
3. Runs the watchdog poll
4. Verifies drift is detected
5. Reverts the setting
6. Verifies resolution

Considerations

• Requires a running Plex server (only runnable on the actual Mac Mini)
• Must be non-destructive (revert any changes)
• Should use a safe setting (e.g., TranscoderThrottleBuffer)
• Could be a manual test script rather than automated CI

Related

• tests/plex-watchdog.bats covers unit tests
• app-setup/templates/plex-watchdog.sh and plex-watchdog-ctl.sh