Add native Qwen3 TTS streaming for Hermes

integrations/hermes-qwen3-stream/README.md

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+# Hermes Qwen3-TTS PCM streaming adapter
+
+This optional Hermes backend plugin uses Athena's native
+`/v1/audio/speech/pcm-stream` route. It starts playback while Qwen3-TTS is
+still synthesizing the current sentence instead of waiting for a complete
+audio file.
+
+Install this directory as `${HERMES_HOME}/plugins/qwen3-stream`, enable the
+plugin and set:
+
+```yaml
+tts:
+  provider: qwen3-stream
+  streaming:
+    provider: qwen3-stream
+```
+
+The adapter reuses `tts.openai.base_url`, `tts.openai.api_key`, model, voice
+and language unless an explicit `tts.qwen3-stream` section overrides them.
+This avoids copying the Athena credential into another file.
+
+Rollback is immediate: restore `tts.provider` and `tts.streaming.provider` to
+`openai`, disable the plugin and restart the Hermes gateway.