Neovim context provider

Purpose

Provides live context from the user's Neovim editor session to help answer context-aware questions about code.

How it works

1. Executes the nvim-context tool to get the current editor state.
2. Returns JSON data including cursor position, open file, visual selection and diagnostics.
3. Use this information to understand references like "this line", "the selection", "current file", etc.

Usage examples

• "What's wrong with this line?" → Check diagnostics at cursor
• "Explain the selected code" → Analyze visual selection
• "What file am I in?" → Return current file path
• "Show me all errors" → List all LSP diagnostics