#97 Fix: [for cherry-picking] Added an explicit ws WebSocket dependency, va

Fixed Findings

• Close voice WebSockets after conversation
• Use an explicit WebSocket implementation
• Restrict voice output paths
• Document the voice conversation tool
• Validate WAV input format

Automated fix from agentic review of https://github.com/wave-av/mcp-server/pull/96

---

^{Need help on this PR? Tag @codesmith-bot with what you need. Autofix is disabled.}