#!/usr/bin/env php
── Equation Schema Validation ──
  ✓ lib/equations.json exists
  ✓ lib/equations.schema.json exists
  ✓ lib/equations.json: valid JSON (24 equations)
  ✓ lib/equations.schema.json: valid JSON (Draft-07)
  ✓ Schema has definitions, properties, and required fields
  ✓ 24 equations found
  ✓ All 24 equations have expected structure
  ✓ All variable definitions are valid
  ✓ All output definitions are valid
  ✓ formula_js_code is a string on all equations
  ✓ All 5 categories have at least one equation

── Summary ──
  ✓ Schema validation passed