fix: modify() preserve unknown top-level schema keys when using pick (#264)

* fix: modify() with pick drops unknown top-level schema keys

pickFields() only copied properties/x-jsf-order/required/allOf/x-jsf-logic,
silently dropping anything else (type, x-rmt-meta, additionalProperties...).
Add a default case so unrecognized keys pass through, matching v0 behavior.

* fix: TS errors from unknown-key pass-through and untyped test assertions

Author: sandrina-p

src/modify-schema.ts

@@ -354,9 +354,8 @@ function pickFields(originalSchema: JsfSchema, fieldsToPick: ModifyConfig['pick'
 
         break
       }
-      case 'x-jsf-logic':
-        newSchema[attrKey] = attrValue
-        break
+      default:
+        (newSchema as Record<string, unknown>)[attrKey] = attrValue
     }
   })
 

test/modify-schema.test.ts

@@ -1146,6 +1146,21 @@ describe('modifySchema', () => {
       expect(warnings).toHaveLength(0)
     })
 
+    it('preserves unknown top-level schema keys (e.g. x-rmt-meta) not just properties/order/allOf', () => {
+      const schemaWithMeta = {
+        ...schemaTickets,
+        'type': 'object',
+        'x-rmt-meta': { jsfOldVersion: true },
+      }
+
+      const { schema } = modifySchema(schemaWithMeta, {
+        pick: ['quantity'],
+      }) as { schema: { 'type'?: string, 'x-rmt-meta'?: unknown } }
+
+      expect(schema.type).toBe('object')
+      expect(schema['x-rmt-meta']).toEqual({ jsfOldVersion: true })
+    })
+
     it('basic usage without conditionals', () => {
       const schemaMinimal = {
         'properties': {