LSP Server for editor support

[dev-dami]

Description

Implement a Language Server Protocol (LSP) server for Carv to enable IDE features.

Features (Priority Order)

1. Syntax highlighting (via TextMate grammar, not LSP)
2. Diagnostics - Show errors/warnings in editor
3. Go to definition - Jump to function/variable definitions
4. Hover - Show type info on hover
5. Completion - Autocomplete suggestions
6. Find references - Find all usages
7. Rename - Refactor symbols

Implementation

• Start with a basic LSP server in Go
• Reuse existing lexer/parser/type-checker
• Protocol: JSON-RPC over stdio

Editor Plugins Needed

• VS Code extension
• Neovim plugin
• Others as requested

Resources

• LSP Specification
• gopls - Go's LSP server for reference

Help Wanted

This would significantly improve the developer experience. Looking for contributors!