Implement Diagnostics Pattern

Add Diagnostics Pattern for the Assertion Checker.

Diagnostics help provide information regarding when and where a specific test fails.

Author: bradcypert

.gitignore

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 .zig-cache/
-zig-out/
+zig-out/
+.DS_Store

CLAUDE.md

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+# CLAUDE.md
+
+This file provides guidance to Claude Code (claude.ai/code) when working with code in this repository.
+
+## Project Overview
+
+HTTPSpec is a command-line tool written in Zig that extends HTTP files with assertions for integration testing. It parses `.http` or `.httpspec` files, executes HTTP requests sequentially, and validates responses against user-defined assertions.
+
+## Key Commands
+
+- **Build**: `zig build`
+- **Run**: `zig build run -- [file_or_directory]`
+- **Test**: `zig build test`
+- **Install**: `zig build install`
+
+## Architecture
+
+### Core Components
+
+- **`src/main.zig`**: Entry point with CLI parsing, file discovery, and parallel test execution using thread pools
+- **`src/httpfile/parser.zig`**: Parses `.http`/`.httpspec` files into structured HttpRequest objects with assertions
+- **`src/httpfile/http_client.zig`**: HTTP client for executing requests and capturing responses
+- **`src/httpfile/assertion_checker.zig`**: Validates responses against assertions (status codes, headers, body content)
+- **`src/reporters/test_reporter.zig`**: Test result reporting and statistics
+
+### File Format
+
+HTTPSpec extends standard `.http` files with assertion syntax:
+```
+### Request name
+GET https://example.com/api/endpoint
+Header: value
+
+//# status == 200
+//# header["content-type"] == "application/json"
+//# body contains "expected"
+```
+
+### Assertion Types
+- **Status**: `status == 200`, `status != 404`
+- **Headers**: `header["content-type"] == "application/json"`
+- **Body**: `body == "exact match"`, `body contains "substring"`
+- **Not equals**: Uses `!=` or `not_contains` operators
+
+### Configuration
+
+- **Threading**: Set `HTTP_THREAD_COUNT` environment variable to control parallel execution
+- **File Discovery**: Recursively finds `.http`/`.httpspec` files when no specific files are provided
+
+### Dependencies
+
+- **clap**: Command-line argument parsing (defined in `build.zig.zon`)
+
+## Testing Strategy
+
+The build system automatically discovers and tests all `.zig` files in the `src/` directory. Tests are run in parallel for better performance.