init ruler

Signed-off-by: Dmytro Stanchiev <git@dmytros.dev>

.ruler/03-ZOD-GUIDE.md

@@ -0,0 +1,19 @@
+## Zod Guidelines
+
+### Schema Definition
+- Define all schemas in `src/types.ts`
+- Use `z.object()` for objects, `z.array()` for arrays
+- Mark optional fields with `.optional()`
+- Create generic schemas for reusable structures
+
+### Type Inference
+- Always infer types from schemas: `export type Foo = z.infer<typeof FooSchema>`
+
+### Validation
+- Use `.parse()` to validate API responses
+- Only validate successful responses (`retcode === RESPONSE_CODES.SUCCESS`)
+- Return unvalidated responses for error cases
+
+### Patterns
+- Follow existing schema naming: `FooSchema` for schemas, `Foo` for types
+- Use `ZZZResponseSchema(dataSchema)` for API responses