Update stale documentation

design.md

@@ -50,11 +50,18 @@ ninja test    # or ctest
 **Individual targets:**
 - `./test_arena_allocator` - Arena allocator unit tests
 - `./test_commit_request` - JSON parsing and validation tests
+- `./test_http_handler` - HTTP protocol handling tests
+- `./test_metric` - Metrics system tests
+- `./test_api_url_parser` - API URL parsing tests
+- `./test_server_connection_return` - Connection lifecycle tests
 
 **Benchmarking:**
 - `./bench_arena_allocator` - Memory allocation performance
 - `./bench_commit_request` - JSON parsing performance
 - `./bench_parser_comparison` - Compare vs nlohmann::json and RapidJSON
+- `./bench_metric` - Metrics system performance
+- `./bench_thread_pipeline` - Lock-free pipeline performance
+- `./bench_format_comparison` - String formatting performance
 
 **Debug tools:**
 - `./debug_arena` - Analyze arena allocator behavior
@@ -73,6 +80,9 @@ ninja test    # or ctest
 - **toml11** - TOML configuration parsing
 - **doctest** - Testing framework
 - **nanobench** - Benchmarking library
+- **nlohmann/json** - JSON library (used in benchmarks)
+- **RapidJSON** - High-performance JSON library (used in benchmarks)
+- **llhttp** - Fast HTTP parser
 
 ---
 
@@ -119,7 +129,7 @@ Ultra-fast memory allocator optimized for request/response patterns:
 - **Streaming data processing** with partial message handling
 - **Connection lifecycle hooks** for initialization and cleanup
 
-#### **Thread Pipeline** (`src/ThreadPipeline.h`)
+#### **Thread Pipeline** (`src/thread_pipeline.hpp`)
 
 A high-performance, multi-stage, lock-free pipeline for inter-thread communication.