Update Documentation

Sync documentation from source-of-truth:

1. Read package.json scripts section

   • Generate scripts reference table
   • Include descriptions from comments

2. Read .env.example

   • Extract all environment variables
   • Document purpose and format

3. Generate docs/CONTRIB.md with:

   • Development workflow
   • Available scripts
   • Environment setup
   • Testing procedures

4. Generate docs/RUNBOOK.md with:

   • Deployment procedures
   • Monitoring and alerts
   • Common issues and fixes
   • Rollback procedures

5. Identify obsolete documentation:

   • Find docs not modified in 90+ days
   • List for manual review

6. Show diff summary

Single source of truth: package.json and .env.example