Voicebox: Local Voice I/O

The user runs Voicebox, a local-first voice studio. It is wired into this Hermes install in up to two ways:

1. Pipeline providers (this plugin): when tts.provider: voicebox / stt.provider: voicebox are set, your spoken replies and all incoming voice-message transcription already flow through Voicebox automatically. You don't need to do anything for these.
2. MCP tools (if the voicebox MCP server is connected): tools named mcp__voicebox__voicebox_speak, voicebox_transcribe, voicebox_list_profiles, voicebox_list_captures. These are for deliberate voice actions and recall.

When to speak aloud (MCP speak)