refactor(tools): fold sniff/read into one with-block, lifecycle timing locals

tools/tts_tool_delivery.py

@@ -335,10 +335,9 @@ def _sniff_audio_container(path: str) -> str:
     from tools.audio_container import sniff_container
     try:
         with open(path, "rb") as fh:
-            head = fh.read(12)
+            return sniff_container(fh.read(12)) or "unknown"
     except OSError:
         return "unknown"
-    return sniff_container(head) or "unknown"
 
 
 def _repair_ogg_container(file_str: str) -> str:
@@ -351,7 +350,7 @@ def _repair_ogg_container(file_str: str) -> str:
     repaired = _ffmpeg_transcode_to_opus(file_str, file_str)
     if repaired:
         return repaired
-    honest = file_str[:-4] + "." + container
+    honest = f"{file_str[:-4]}.{container}"
     try:
         os.replace(file_str, honest)
     except OSError:

tools/tts_tool_lifecycle.py

@@ -89,8 +89,7 @@ def warm_tts_provider(tts_config: Optional[Dict[str, Any]] = None, provider: Opt
     warmer = _local_tts_warmers().get(name)
     if warmer is not None:
         cache = _LOCAL_TTS_MODEL_CACHES.get(name, {})
-        before = len(cache)
-        started = time.monotonic()
+        before, started = len(cache), time.monotonic()
         try:
             warmer(tts_config)
         except Exception as exc:  # engine missing, download failed, bad voice…

tools/tts_tool_speaker.py

@@ -183,8 +183,8 @@ class _StreamerPlayback:
         self._prefetch_sem.acquire()
         chunk_queue: "queue.Queue[Optional[bytes]]" = queue.Queue(maxsize=self._CHUNK_QUEUE_MAX)
         self._audio_queue.put(chunk_queue)
-        self._prefetch_threads.append(
-            threading.Thread(target=self._consume_to_queue, args=(audio_iter, chunk_queue), daemon=True))
+        self._prefetch_threads.append(threading.Thread(
+            target=self._consume_to_queue, args=(audio_iter, chunk_queue), daemon=True))
         self._prefetch_threads[-1].start()
 
     def _consume_to_queue(self, audio_iter: Iterator[bytes], chunk_queue: "queue.Queue[Optional[bytes]]") -> None: