**chore: remove outdated changelog and summary documents**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

CHANGELOG.md

@@ -0,0 +1,76 @@
+# Changelog
+
+All notable changes to this project will be documented in this file.
+
+The format is based on [Keep a Changelog](https://keepachangelog.com/en/1.0.0/),
+and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0.html).
+
+## [Unreleased]
+
+### Added
+
+### Changed
+
+### Fixed
+
+## [0.26.0] - 2025-07-30
+
+### Added
+- Organized documentation structure with docs/ directory
+- Proper CHANGELOG.md for release management
+- Statistics optimizations implemented across all storage adapters
+- In-memory caching of statistics data
+- Batched updates with adaptive flush timing
+- Time-based partitioning for statistics files
+- Error handling and retry mechanisms for statistics operations
+
+### Changed
+- Moved technical documentation to docs/technical/
+- Moved development documentation to docs/development/
+- Moved guides to docs/guides/
+- Archived temporary documentation files
+- Refactored BaseStorageAdapter to include shared optimizations
+- Updated FileSystemStorage, MemoryStorage, and OPFSStorage with new statistics handling
+- Improved performance through reduced storage operations
+- Enhanced scalability with time-based partitioning
+
+### Fixed
+- Fixed FileSystemStorage constructor path operations issue where path module was used before being fully loaded
+- Deferred path operations to init() method when path module is guaranteed to be available
+- Resolved "Cannot read properties of undefined (reading 'join')" error
+
+### Technical Details
+- Added `scheduleBatchUpdate()` and `flushStatistics()` methods to BaseStorageAdapter
+- Updated core statistics methods: `saveStatistics()`, `getStatistics()`, `incrementStatistic()`, `decrementStatistic()`, and `updateHnswIndexSize()`
+- Maintained backward compatibility with legacy statistics files
+- Added fallback mechanisms for multiple storage locations
+
+## [Previous Versions]
+
+For detailed implementation notes and technical summaries of previous versions, see:
+- `docs/technical/` - Technical documentation and analysis
+- `archive/` - Archived change logs and summaries
+
+---
+
+## How to Update This Changelog
+
+When making changes to the project:
+
+1. Add new entries under `[Unreleased]` section
+2. Use the following categories:
+   - `Added` for new features
+   - `Changed` for changes in existing functionality
+   - `Deprecated` for soon-to-be removed features
+   - `Removed` for now removed features
+   - `Fixed` for any bug fixes
+   - `Security` for vulnerability fixes
+
+3. When releasing a new version:
+   - Move unreleased changes to a new version section
+   - Update the version number and date
+   - Create a new empty `[Unreleased]` section
+
+4. Link to GitHub releases: `[0.26.0] - 2025-07-28` format
+5. Keep entries concise but informative for users
+6. Include technical details in a separate subsection if needed

docs/DOCUMENTATION_ORGANIZATION.md

@@ -0,0 +1,124 @@
+# Documentation Organization
+
+This document explains the new documentation structure and workflow for managing markdown files in the Brainy project.
+
+## Overview
+
+The documentation has been reorganized from 29 scattered markdown files at the root level to a clean, organized structure with only essential files at the root and categorized documentation in the `docs/` directory.
+
+## New Structure
+
+### Root Level Files (GitHub/NPM Standards)
+- `README.md` - Main project documentation
+- `CONTRIBUTING.md` - Contribution guidelines  
+- `CODE_OF_CONDUCT.md` - Community standards
+- `CHANGELOG.md` - Version history and release notes
+
+### Documentation Directory Structure
+```
+docs/
+├── technical/           # Technical documentation and analysis
+│   ├── concurrency-analysis.md
+│   ├── storage-concurrency-analysis.md
+│   ├── threading.md
+│   ├── statistics.md
+│   ├── testing.md
+│   ├── vitest-improvements.md
+│   ├── realtime-updates.md
+│   ├── metadata-handling.md
+│   ├── vector-dimension-standardization.md
+│   ├── use-model-loading-explanation.md
+│   ├── dimension-mismatch-summary.md
+│   ├── storage-testing.md
+│   ├── technical-guides.md
+│   └── concurrency-implementation-summary.md
+├── development/         # Development and contributor documentation
+│   ├── developers.md
+│   ├── documentation-standards.md
+│   ├── markdown-conventions.md
+│   ├── expected-test-messages.md
+│   └── pretty-test-reporter.md
+└── guides/             # User guides and migration documentation
+    └── production-migration-guide.md
+```
+
+### Archive Directory
+```
+archive/                # Archived and temporary files
+├── changes.md          # Old detailed changelog
+├── changes-summary.md  # Old changelog summary
+├── demo.md            # Demo documentation
+├── fix-documentation.md # Temporary fix notes
+└── test-issue-summary.md # Test issue summary
+```
+
+## CHANGELOG.md Management
+
+### Automated Workflow
+
+The project now uses automated changelog management:
+
+1. **Adding Changes**: Add entries to the `[Unreleased]` section in `CHANGELOG.md`
+2. **Version Bumping**: Use npm scripts that automatically update the changelog:
+   - `npm run version:patch` - Patch version bump + changelog update
+   - `npm run version:minor` - Minor version bump + changelog update  
+   - `npm run version:major` - Major version bump + changelog update
+
+3. **Manual Updates**: Use `npm run changelog:update` to manually update the changelog
+
+### Changelog Format
+
+The changelog follows the [Keep a Changelog](https://keepachangelog.com/) standard:
+
+- **Added** - New features
+- **Changed** - Changes in existing functionality
+- **Deprecated** - Soon-to-be removed features
+- **Removed** - Now removed features
+- **Fixed** - Bug fixes
+- **Security** - Vulnerability fixes
+
+### GitHub Integration
+
+The CHANGELOG.md is automatically used for:
+- GitHub releases (via `scripts/create-github-release.js`)
+- NPM package release notes
+- Version history tracking
+
+## Benefits of New Structure
+
+1. **Clean Root Directory**: Reduced from 29 to 4 essential markdown files
+2. **Better Organization**: Logical categorization of documentation
+3. **GitHub Compliance**: Follows GitHub and NPM best practices
+4. **Automated Maintenance**: Changelog updates are automated
+5. **Easy Navigation**: Clear directory structure for different doc types
+6. **Historical Preservation**: Old documentation archived, not lost
+
+## Workflow for Contributors
+
+### Adding Documentation
+1. **Technical docs** → `docs/technical/`
+2. **Development docs** → `docs/development/`
+3. **User guides** → `docs/guides/`
+4. **Temporary files** → `archive/` (if needed)
+
+### Making Changes
+1. Add changes to `[Unreleased]` section in `CHANGELOG.md`
+2. Use appropriate category (Added, Changed, Fixed, etc.)
+3. When ready to release, use `npm run version:patch/minor/major`
+4. The changelog will be automatically updated with version and date
+
+### Release Process
+1. Ensure `[Unreleased]` section has all changes
+2. Run `npm run version:patch/minor/major`
+3. Run `npm run deploy` to publish and create GitHub release
+4. GitHub release will use CHANGELOG.md content
+
+## Migration Notes
+
+- All technical documentation moved to `docs/technical/`
+- Development documentation moved to `docs/development/`
+- Old changelog files archived in `archive/`
+- Links in existing documentation may need updates
+- New automation ensures changelog stays current
+
+This reorganization provides a sustainable, scalable approach to documentation management that follows industry best practices and integrates seamlessly with GitHub and NPM workflows.

package.json

@@ -55,9 +55,11 @@
     "start": "node dist/unified.js",
     "demo": "npm run build && npm run build:browser && npx http-server -o /demo/index.html",
     "version": "echo 'Version updated in package.json'",
-    "version:patch": "npm version patch",
-    "version:minor": "npm version minor",
-    "version:major": "npm version major",
+    "version:patch": "npm version patch && node scripts/update-changelog.js",
+    "version:minor": "npm version minor && node scripts/update-changelog.js",
+    "version:major": "npm version major && node scripts/update-changelog.js",
+    "changelog:update": "node scripts/update-changelog.js",
+    "changelog:check": "echo 'Please ensure CHANGELOG.md [Unreleased] section has your changes before releasing'",
     "lint": "eslint --ext .ts,.js src/",
     "lint:fix": "eslint --ext .ts,.js src/ --fix",
     "format": "prettier --write \"src/**/*.{ts,js}\"",

scripts/update-changelog.js

@@ -0,0 +1,138 @@
+#!/usr/bin/env node
+
+/* eslint-env node */
+/* eslint no-console: "off" */
+
+/**
+ * Update Changelog Script
+ *
+ * This script helps maintain the CHANGELOG.md file by:
+ * 1. Moving unreleased changes to a new version section
+ * 2. Adding the current date
+ * 3. Creating a new empty unreleased section
+ * 
+ * Usage:
+ * - npm run changelog:update - Interactive mode to update changelog
+ * - node scripts/update-changelog.js <version> - Direct version update
+ */
+
+import fs from 'fs'
+import path from 'path'
+import { fileURLToPath } from 'url'
+
+// Get the directory of the current module
+const __filename = fileURLToPath(import.meta.url)
+const __dirname = path.dirname(__filename)
+
+// Path to the root directory and CHANGELOG.md
+const rootDir = path.join(__dirname, '..')
+const changelogPath = path.join(rootDir, 'CHANGELOG.md')
+
+// Get version from command line argument or package.json
+function getVersion() {
+  const args = process.argv.slice(2)
+  if (args.length > 0) {
+    return args[0]
+  }
+  
+  // Read from package.json
+  const packageJsonPath = path.join(rootDir, 'package.json')
+  const packageJson = JSON.parse(fs.readFileSync(packageJsonPath, 'utf8'))
+  return packageJson.version
+}
+
+// Get current date in YYYY-MM-DD format
+function getCurrentDate() {
+  return new Date().toISOString().split('T')[0]
+}
+
+// Update the changelog
+function updateChangelog(version) {
+  if (!fs.existsSync(changelogPath)) {
+    console.error('CHANGELOG.md not found!')
+    process.exit(1)
+  }
+
+  const changelog = fs.readFileSync(changelogPath, 'utf8')
+  const lines = changelog.split('\n')
+  
+  // Find the unreleased section
+  const unreleasedIndex = lines.findIndex(line => line.includes('## [Unreleased]'))
+  if (unreleasedIndex === -1) {
+    console.error('Could not find [Unreleased] section in CHANGELOG.md')
+    process.exit(1)
+  }
+
+  // Find the next version section or end of unreleased content
+  let nextSectionIndex = lines.findIndex((line, index) => 
+    index > unreleasedIndex && line.startsWith('## [') && !line.includes('[Unreleased]')
+  )
+  
+  if (nextSectionIndex === -1) {
+    nextSectionIndex = lines.length
+  }
+
+  // Extract unreleased content
+  const unreleasedContent = lines.slice(unreleasedIndex + 1, nextSectionIndex)
+  
+  // Check if there's actual content in unreleased section
+  const hasContent = unreleasedContent.some(line => 
+    line.trim() && !line.startsWith('#') && line.includes('-')
+  )
+
+  if (!hasContent) {
+    console.log('No unreleased changes found. Please add changes to the [Unreleased] section first.')
+    console.log('Example:')
+    console.log('## [Unreleased]')
+    console.log('')
+    console.log('### Added')
+    console.log('- New feature description')
+    console.log('')
+    console.log('### Fixed')
+    console.log('- Bug fix description')
+    return
+  }
+
+  // Create new version section
+  const currentDate = getCurrentDate()
+  const newVersionSection = [
+    `## [${version}] - ${currentDate}`,
+    ...unreleasedContent
+  ]
+
+  // Create new unreleased section
+  const newUnreleasedSection = [
+    '## [Unreleased]',
+    '',
+    '### Added',
+    '',
+    '### Changed',
+    '',
+    '### Fixed',
+    '',
+  ]
+
+  // Reconstruct the changelog
+  const newLines = [
+    ...lines.slice(0, unreleasedIndex),
+    ...newUnreleasedSection,
+    ...newVersionSection,
+    ...lines.slice(nextSectionIndex)
+  ]
+
+  // Write the updated changelog
+  fs.writeFileSync(changelogPath, newLines.join('\n'))
+  console.log(`✅ CHANGELOG.md updated for version ${version}`)
+  console.log(`📅 Release date: ${currentDate}`)
+  console.log('🔄 New [Unreleased] section created')
+}
+
+// Main execution
+try {
+  const version = getVersion()
+  console.log(`Updating CHANGELOG.md for version ${version}...`)
+  updateChangelog(version)
+} catch (error) {
+  console.error('Error updating changelog:', error.message)
+  process.exit(1)
+}