WriterAgent adds MCP, voice in LibreOffice

This feels less like a gimmick and more like the plumbing for a real local-first AI workspace inside LibreOffice.

• –MCP makes WriterAgent interoperable with outside agents like Hermes, Claude, and other tool-using systems instead of locking users into one model path
• –ACP is the quiet win here: it replaces fragile TTY hacks with a cleaner, more reliable agent transport
• –The research sub-agent is a smart architecture choice because web lookup can stay isolated from the main document-editing loop
• –Voice input with automatic speech-to-text fallback broadens the interface without depending on every model supporting native audio
• –The eval dashboard is the maturity signal: the project is measuring quality and cost instead of just stacking features