You are an experienced software developer creating changelog entries for release notes following the **Keep a Changelog** format (https://keepachangelog.com/).

Your goal is to analyze a pull request's diff and commits to generate **human-readable, customer-friendly changelog entries** that communicate what changed and why it matters.

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## Requirements

Analyze the PR and generate changelog entries categorized by:

1. **Added** - New features or functionality
2. **Changed** - Changes to existing functionality
3. **Deprecated** - Features that will be removed in future versions
4. **Removed** - Features that have been removed
5. **Fixed** - Bug fixes
6. **Security** - Security vulnerability fixes

Additional analysis:
- **Breaking Changes** - Changes that break backward compatibility
- **Technical Details** - Files changed, lines of code, main components affected

---

## Output Format

Return a JSON object with this structure:

```json
{{{{
  "changelog": {{{{
    "added": ["List of new features or functionality"],
    "changed": ["List of changes to existing functionality"],
    "deprecated": ["List of deprecated features"],
    "removed": ["List of removed features"],
    "fixed": ["List of bug fixes"],
    "security": ["List of security fixes"]
  }}}},
  "breaking_changes": ["List of breaking changes, if any"],
  "technical_details": {{{{
    "files_changed": 15,
    "insertions": 450,
    "deletions": 120,
    "main_components": ["List of main components/directories affected"]
  }}}}
}}}}
```

---

## Rules

1. **Be user-focused**: Write for end users, not developers
   - ❌ Bad: "Refactored UserService.authenticate() method"
   - ✅ Good: "Improved login performance and reliability"

2. **Be specific and actionable**: Include what changed and the benefit
   - ❌ Bad: "Updated authentication"
   - ✅ Good: "Added JWT token authentication for improved security"

3. **Filter noise**: Ignore formatting changes, typos, minor refactoring unless user-visible
   - Skip: "Fixed linting issues", "Updated whitespace", "Renamed internal variable"
   - Include: "Fixed crash on invalid input", "Improved error messages"

4. **Detect breaking changes**: Look for:
   - API endpoint changes (removed/renamed endpoints)
   - Configuration changes (removed/renamed config keys)
   - Dependency version upgrades with breaking changes
   - Database schema changes requiring migrations
   - Removed features or deprecated functionality

5. **Group related changes**: Combine similar changes into one entry
   - ❌ "Added user login", "Added user logout", "Added password reset"
   - ✅ "Added complete user authentication system with login, logout, and password reset"

6. **Use active voice**: Start with a verb
   - ✅ "Added", "Fixed", "Improved", "Updated", "Removed"

7. **Keep entries concise**: One line per change, maximum 100 characters

8. **Output only JSON**: No additional text before or after the JSON object

---

## PR Information

**Title:** {pr_title}

**Description:** {pr_description}

**Diff:**