feat: Implement Comprehensive MCP Tool End-to-End Testing Framework

- Replace basic simulation with real MCP server integration
- Add comprehensive parameter validation testing (300+ test cases planned)
- Implement 6-phase testing approach: parameter validation, error handling,
  response format validation, performance testing, real-world scenarios, and integration
- Add enhanced test result structures with detailed validation metrics
- Implement comprehensive test case execution with timing and validation
- Add detailed test reporting with success criteria validation
- Support both simulation and real server modes for flexible testing
- Implement trace_path and search_content comprehensive testing (60+ and 50+ cases)
- Add validation for response schemas, performance thresholds, and error handling
- Create extensible framework for all 18+ MCP tools testing
- Include memory usage tracking and performance benchmarking infrastructure

Key Features:
- Real MCP server lifecycle management
- Comprehensive parameter validation (required, optional, type, range)
- Error condition testing (file not found, permissions, timeouts)
- Response format validation with JSON schema checking
- Performance testing with configurable thresholds
- Detailed validation results with error categorization
- Test categorization (ParameterValidation, ErrorHandling, ResponseFormat, etc.)
- Comprehensive reporting with success criteria evaluation

closes #81

Author: milliondreams