Add auto-generated CHANGELOG from GitHub releases

New Features:
- Created scripts/generate-changelog.js to auto-generate CHANGELOG.md
- Fetches all GitHub releases and formats into Keep a Changelog format
- Added npm run changelog:generate command

Version-Bump Skill Updates:
- Added Step 10: Generate CHANGELOG to workflow
- Updated verification checklist to include CHANGELOG generation
- Updated skill description and critical rules
- Single source of truth: GitHub releases

Technical Details:
- Script fetches releases via gh CLI
- Parses release bodies and formats to markdown
- Removes duplicate headers and Claude Code footers
- Sorts releases by date (newest first)
- Generates clean, consistent changelog

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude <noreply@anthropic.com>

package.json

@@ -40,6 +40,7 @@
     "worker:stop": "pm2 stop claude-mem-worker",
     "worker:restart": "pm2 restart claude-mem-worker",
     "worker:logs": "pm2 logs claude-mem-worker",
+    "changelog:generate": "node scripts/generate-changelog.js",
     "usage:analyze": "node scripts/analyze-usage.js",
     "usage:today": "node scripts/analyze-usage.js $(date +%Y-%m-%d)"
   },