chore(ci): trigger GPU integration tests on ephemeral runners

Verifies the n1+T4 ephemeral runner path after the 2026-05-17 dispatcher
e2 fix (karaoke-gen#776). The GPU family was not affected by that bug
(n1 supports onHostMaintenance=TERMINATE, required for attached GPUs),
but has not been exercised under the ephemeral dispatcher since cutover.

Trivial comment in `audio_separator/separator/__init__.py` flips the
`audio_separator/**` path filter so the 3-job integration test suite
(ensemble-presets, core-models, stems-and-quality) runs on freshly
created GPU VMs. Safe to remove on next edit.

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

Author: beveradb

audio_separator/separator/__init__.py

@@ -1 +1,3 @@
+# Trivial comment to trigger GPU integration tests on ephemeral self-hosted
+# runners after the 2026-05-17 dispatcher fix. Safe to remove on next edit.
 from .separator import Separator