# STEP 9C — HUMAN DESIGN ENGINE

Clean upload package for the Numerology Platform.

## What changed
- Replaces the Step 9C manual Human Design entry form with an automatic chart calculation form.
- Uses the saved Numerology birth date automatically.
- User supplies exact birth time, birth timezone, and optional birth place.
- Calculates Personality and Design layers using the 88-degree solar-arc method.
- Maps 13 activations per layer to the 64-gate wheel and six lines.
- Detects defined channels and centres.
- Derives Type, Strategy, Authority, Profile and Definition.
- Shows Personality and Design activations and Incarnation Cross gates.
- Keeps the existing Numerology × Human Design integration layer.

## Database
No database schema changes. No SQL import is required.

## Credentials
Do not replace your existing `api/config/database.php` or any credential file.

## Test
Local engine test: `tests/test-human-design-engine.php` — 8/8 PASS.
PHP syntax checks: PASS.
JavaScript syntax check: PASS.

## Important calculation note
This package uses a self-contained astronomical approximation so it does not require an external API or a server-side ephemeris extension. For production-grade astronomical precision, the engine can later be validated against a Swiss Ephemeris reference set before public launch.