feat: improve editor tooling and fix warnings

Neovim improvements:
- Add tree-sitter text objects for functions, types, blocks
- Add folding support
- Enhanced REPL integration (toggle, send line/selection)
- New commands: LuxCheck, LuxReplToggle, LuxSend
- Better keybindings with localleader

VS Code extension:
- Full syntax highlighting with TextMate grammar
- LSP client integration
- 20+ snippets for common patterns
- Commands: run, format, check, REPL
- Keybindings and context menu

Fixes:
- Fix all cargo warnings with #[allow(dead_code)] annotations
- Clean up unused variables

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

src/compiler.rs

@@ -3,6 +3,8 @@
 //! This module compiles Lux programs to native machine code using Cranelift.
 //! Currently supports a subset of the language for performance-critical code.
 
+#![allow(dead_code)]
+
 use crate::ast::{Expr, Program, Declaration, FunctionDecl, BinaryOp, UnaryOp, LiteralKind, Statement};
 use cranelift_codegen::ir::{AbiParam, InstBuilder, Value, types};
 use cranelift_codegen::ir::condcodes::IntCC;

src/formatter.rs

@@ -12,6 +12,7 @@ use crate::parser::Parser;
 
 /// Formatter configuration
 #[derive(Debug, Clone)]
+#[allow(dead_code)]
 pub struct FormatConfig {
     /// Number of spaces for indentation
     pub indent_size: usize,

src/package.rs

@@ -161,7 +161,7 @@ impl PackageManager {
         println!("Installing {} dependencies...", manifest.dependencies.len());
         println!();
 
-        for (name, dep) in &manifest.dependencies {
+        for (_name, dep) in &manifest.dependencies {
             self.install_dependency(dep)?;
         }
 
@@ -351,6 +351,7 @@ impl PackageManager {
     }
 
     /// Get the search paths for installed packages
+    #[allow(dead_code)]
     pub fn get_package_paths(&self) -> Vec<PathBuf> {
         let mut paths = vec![];