Syncable Entity: Builder & Validation (Step 3/6)

Purpose: Implement business rule validation and create migration action builders.

When to use: After completing Steps 1-2 (Types, Cache, Transform). Required before implementing action handlers.

Quick Start

This step creates:

1. Validator service (business logic validation)
2. Builder service (action creation)
3. Orchestrator wiring (CRITICAL - often forgotten!)

Key principles:

• Validators never throw - return error arrays
• Validators never mutate - pass optimistic entity maps
• Use indexed lookups (O(1)) not Object.values().find() (O(n))