chore: clean up development artifacts and update .gitignore

- Remove AI agent coordination files and progress tracking
- Remove temporary test results and generated artifacts
- Remove diagnostic test scripts from src/scripts/
- Remove development planning documents
- Update .gitignore to exclude test artifacts
- Clean up 53 temporary files total

tests/unit/services/config-validator.test.summary.md

@@ -1,81 +0,0 @@
-# ConfigValidator Test Summary
-
-## Task Completed: 3.1 - Unit Tests for ConfigValidator
-
-### Overview
-Created comprehensive unit tests for the ConfigValidator service with 44 test cases covering all major functionality.
-
-### Test Coverage
-- **Statement Coverage**: 95.21%
-- **Branch Coverage**: 92.94%
-- **Function Coverage**: 100%
-- **Line Coverage**: 95.21%
-
-### Test Categories
-
-#### 1. Basic Validation (Original 26 tests)
-- Required fields validation
-- Property type validation
-- Option value validation
-- Property visibility based on displayOptions
-- Node-specific validation (HTTP Request, Webhook, Database, Code)
-- Security checks
-- Syntax validation for JavaScript and Python
-- n8n-specific patterns
-
-#### 2. Edge Cases and Additional Coverage (18 new tests)
-- Null and undefined value handling
-- Nested displayOptions conditions
-- Hide conditions in displayOptions
-- $helpers usage validation
-- External library warnings
-- Crypto module usage
-- API authentication warnings
-- SQL performance suggestions
-- Empty code handling
-- Complex return patterns
-- Console.log/print() warnings
-- $json usage warnings
-- Internal property handling
-- Async/await validation
-
-### Key Features Tested
-
-1. **Required Field Validation**
-   - Missing required properties
-   - Conditional required fields based on displayOptions
-
-2. **Type Validation**
-   - String, number, boolean type checking
-   - Null/undefined handling
-
-3. **Security Validation**
-   - Hardcoded credentials detection
-   - SQL injection warnings
-   - eval/exec usage
-   - Infinite loop detection
-
-4. **Code Node Validation**
-   - JavaScript syntax checking
-   - Python syntax checking
-   - n8n return format validation
-   - Missing return statements
-   - External library usage
-
-5. **Performance Suggestions**
-   - SELECT * warnings
-   - Unused property warnings
-   - Common property suggestions
-
-6. **Node-Specific Validation**
-   - HTTP Request: URL validation, body requirements
-   - Webhook: Response mode validation
-   - Database: Query security
-   - Code: Syntax and patterns
-
-### Test Infrastructure
-- Uses Vitest testing framework
-- Mocks better-sqlite3 database
-- Uses node factory from fixtures
-- Follows established test patterns
-- Comprehensive assertions for errors, warnings, and suggestions