STEP 9D — CLEAN UPLOAD
======================
Feature: Numerology Relationship Compatibility
Baseline: Confirmed working Step 9C Human Design Engine
Methodology: book-v1 Part Six — Numbers and Frequency Family

Added:
- CompatibilityCalculator.php
- CompatibilityController.php
- compatibility.php route
- Dashboard compatibility UI
- Dashboard compatibility client logic
- Step 9D unit test

Compatibility compares:
- Life Path
- Destiny / Expression
- Soul Urge

Outputs:
- Overall compatibility classification
- Dimension-by-dimension classification
- Relationship tone
- Frequency families
- Combined frequency
- Bridge frequency guidance

Database schema changes: NONE
SQL import: NOT REQUIRED
Database credentials: PRESERVE EXISTING FILE