Update STATE.scm - validation framework complete (85%→90%)

- Phase: Real-World Validation Framework Complete
- Overall completion: 90%
- New validation component (90% complete, status: ready)
- Milestone v1.0-production: IN_PROGRESS
- Validation framework complete (RealWorldTest.php, run-validation.sh, etc.)
- Updated blockers, next actions, session history
- Ready for validation execution

Co-Authored-By: Claude Sonnet 4.5 <noreply@anthropic.com>

Author: Your Name