**chore: remove outdated changelog and summary documents**

- Deleted `CHANGES.md`, `CHANGES_SUMMARY.md`, `CONCURRENCY_ANALYSIS.md`, `CONCURRENCY_IMPLEMENTATION_SUMMARY.md`, and related developer documentation files.
- Removed redundant or legacy content no longer aligned with the current codebase and workflows.
- Updated repository to reflect streamlined documentation approach, reducing clutter and improving maintainability.

**Purpose**: Simplify and declutter repository by removing obsolete documentation files, ensuring it remains focused and relevant.

docs/development/PRETTY_TEST_REPORTER.md

@@ -0,0 +1,73 @@
+# Pretty Test Reporter for Brainy
+
+This document describes the visually enhanced test reporter added to the Brainy project.
+
+## Overview
+
+The Pretty Test Reporter provides a visually appealing summary of test results with colors, symbols, and formatted output. It enhances the standard Vitest output with a clear, easy-to-read summary at the end of test runs.
+
+## Features
+
+- 🎨 **Colorful Output**: Uses colors to distinguish between passed, failed, and skipped tests
+- 📊 **Tabular Format**: Displays test results in a clean, tabular format
+- 📝 **Detailed Summary**: Shows overall test statistics and file-by-file breakdown
+- ❌ **Error Reporting**: Clearly lists any failed tests with their error messages
+- ⏱️ **Timing Information**: Displays test duration in a human-readable format
+
+## Usage
+
+To run tests with the pretty reporter, use the following npm script:
+
+```bash
+npm run test:report:pretty
+```
+
+You can also specify specific test files:
+
+```bash
+npm run test:report:pretty -- tests/core.test.ts
+```
+
+## Example Output
+
+```
+━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━
+📊 TEST SUMMARY REPORT
+━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━
+
+Test Run Completed in: 7.9s
+Date: 7/28/2025, 11:22:54 AM
+Total Test Files: 1
+Total Tests: 19
+
+Results:
+  ✓ Passed: 19
+  ✗ Failed: 0
+  ○ Skipped: 0
+
+Test Files:
+┌──────────────────────────────────────────────────┬──────────┬──────────┬──────────┐
+│ File                                              │ Passed    │ Failed    │ Skipped   │
+├──────────────────────────────────────────────────┼──────────┼──────────┼──────────┤
+│ core.test.ts                                      │ 19        │ 0         │ 0         │
+└──────────────────────────────────────────────────┴──────────┴──────────┴──────────┘
+
+ PASSED  All tests passed successfully!
+```
+
+## Implementation Details
+
+The pretty reporter is implemented as a custom Vitest reporter in `src/testing/prettySummaryReporter.ts`. It:
+
+1. Collects test information during the test run
+2. Tracks passed, failed, and skipped tests
+3. Organizes results by test file
+4. Generates a formatted summary at the end of the test run
+
+## Configuration
+
+The reporter is configured in `vitest.config.ts` and works alongside the default Vitest reporter and JSON reporter. This provides both the standard output during test execution and the enhanced summary at the end.
+
+## Customization
+
+If you need to modify the reporter's appearance or behavior, you can edit the `prettySummaryReporter.ts` file. The main visual elements are in the `printSummary` method.