feat(tools): add Voxtral TTS provider (Mistral AI)

hermes_cli/config.py

@@ -458,7 +458,7 @@ DEFAULT_CONFIG = {
     
     # Text-to-speech configuration
     "tts": {
-        "provider": "edge",  # "edge" (free) | "elevenlabs" (premium) | "openai" | "neutts" (local)
+        "provider": "edge",  # "edge" (free) | "elevenlabs" (premium) | "openai" | "minimax" | "mistral" | "neutts" (local)
         "edge": {
             "voice": "en-US-AriaNeural",
             # Popular: AriaNeural, JennyNeural, AndrewNeural, BrianNeural, SoniaNeural
@@ -472,6 +472,10 @@ DEFAULT_CONFIG = {
             "voice": "alloy",
             # Voices: alloy, echo, fable, onyx, nova, shimmer
         },
+        "mistral": {
+            "model": "voxtral-mini-tts-2603",
+            "voice_id": "c69964a6-ab8b-4f8a-9465-ec0925096ec8",  # Paul - Neutral
+        },
         "neutts": {
             "ref_audio": "",  # Path to reference voice audio (empty = bundled default)
             "ref_text": "",   # Path to reference voice transcript (empty = bundled default)
@@ -1016,6 +1020,13 @@ OPTIONAL_ENV_VARS = {
         "password": True,
         "category": "tool",
     },
+    "MISTRAL_API_KEY": {
+        "description": "Mistral API key for Voxtral TTS and transcription (STT)",
+        "prompt": "Mistral API key",
+        "url": "https://console.mistral.ai/",
+        "password": True,
+        "category": "tool",
+    },
     "GITHUB_TOKEN": {
         "description": "GitHub token for Skills Hub (higher API rate limits, skill publish)",
         "prompt": "GitHub Token",