feat: comprehensive development progress

- Pattern matching implementation extended in match_expr.rs
- CLI configuration structured with categorized groups (task recommendation completed)
- Python LLVM builder split into function_lower.py (task recommendation completed)
- parse_box_declaration massive function refactored (task recommendation completed)
- Phase 16 Macro Revolution comprehensive planning and documentation
- Archive legacy phase documentation for clean structure
- HTTP message box improvements and performance optimizations
- MIR builder enhancements and control flow improvements

🤖 Generated with [Claude Code](https://claude.ai/code)

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

src/boxes/http_message_box.rs

@@ -351,7 +351,7 @@ impl HTTPResponseBox {
 
     /// Quick HTML response creation
     pub fn create_html_response(content: Box<dyn NyashBox>) -> Self {
-        let mut response = HTTPResponseBox::new();
+        let response = HTTPResponseBox::new();
         *response.status_code.lock().unwrap() = 200;
         *response.status_message.lock().unwrap() = "OK".to_string();
         response.headers.lock().unwrap().insert(
@@ -364,7 +364,7 @@ impl HTTPResponseBox {
 
     /// Quick JSON response creation
     pub fn create_json_response(content: Box<dyn NyashBox>) -> Self {
-        let mut response = HTTPResponseBox::new();
+        let response = HTTPResponseBox::new();
         *response.status_code.lock().unwrap() = 200;
         *response.status_message.lock().unwrap() = "OK".to_string();
         response.headers.lock().unwrap().insert(
@@ -377,7 +377,7 @@ impl HTTPResponseBox {
 
     /// Quick 404 response creation
     pub fn create_404_response() -> Self {
-        let mut response = HTTPResponseBox::new();
+        let response = HTTPResponseBox::new();
         *response.status_code.lock().unwrap() = 404;
         *response.status_message.lock().unwrap() = "Not Found".to_string();
         response.headers.lock().unwrap().insert(