fix(engines): list pockettts in docs inventory; drop unused logger

docs/features.yaml tts_engines now includes pockettts, clearing the docs-drift test that failed CI (every registered engine must be in the inventory). Removed the unused logger line CodeQL flagged. No readme/doc entry yet, matching opt-in engines like supertonic3 and omnivoice-gguf; a doc page can land with the rest of the integration.

backend/engines/pockettts/__init__.py

@@ -36,7 +36,6 @@ the PR.
 """
 from __future__ import annotations
 
-import logging
 import sys
 from pathlib import Path
 from typing import TYPE_CHECKING
@@ -46,8 +45,6 @@ from services.subprocess_backend import SubprocessBackend
 if TYPE_CHECKING:
     import torch  # noqa: F401
 
-logger = logging.getLogger("omnivoice.pockettts")
-
 
 class PocketTTSBackend(SubprocessBackend):
     """Kyutai PocketTTS in a killable, CPU-only sidecar process."""

docs/features.yaml

@@ -57,6 +57,7 @@ tts_engines:
   - id: confucius4-tts
     readme: "**Confucius4-TTS**"
     doc: docs/engines/confucius4-tts.md
+  - id: pockettts
 
 # Same contract against backend/services/asr_backend.py _REGISTRY.
 asr_engines: