Add Feature End-to-End

Implement feature described in $ARGUMENTS across the full stack.

Step 0: Decide Scope

Before writing code, answer:

1. CE, EE, or both? If both → use hooksFactory (CE default + EE override in app.ts)
2. Need a plan flag? → Add to PlatformPlan entity + LicenseKeyEntity type + plan constants in shared
3. Need a Permission? → Add to Permission enum in shared
4. Affects billing/quotas? → Add enforcement in controller
5. Must work embedded? → Check EmbeddingState in frontend
6. Project-scoped or platform-scoped? → Filter queries accordingly

Step 1: Shared Types (packages/core/shared)

• Define Zod schemas + z.infer types in src/lib/{domain}/
• Export from src/index.ts barrel
• Bump version in package.json (patch for fix, minor for new export)