test(anthropic): lock the structured-output schema non-mutation invariant

The builder deep-clones before walking so it never deletes enum/const from
the caller's schema object. Agent blocks inside a parallel or loop reuse the
same responseFormat object across iterations, so losing that clone would
strip the constraints from every iteration after the first. Verified the
test fails when the clone is removed.

Author: waleedlatif1

apps/sim/providers/anthropic/core.request.test.ts

@@ -506,6 +506,23 @@ describe('executeAnthropicProviderRequest native structured outputs', () => {
     expect(wireSchema.properties.off.const).toBe(false)
   })
 
+  it("does not mutate the caller's schema, so parallel iterations reuse it safely", async () => {
+    const shared = {
+      type: 'object',
+      additionalProperties: false,
+      required: ['kind'],
+      properties: { kind: { type: 'string', enum: ['a', 'b'], description: 'd' } },
+    }
+    const before = JSON.stringify(shared)
+
+    const first = await sendSchema(shared)
+    const second = await sendSchema(shared)
+
+    expect(JSON.stringify(shared)).toBe(before)
+    expect(first.properties.kind.enum).toEqual(['a', 'b'])
+    expect(second.properties.kind.enum).toEqual(['a', 'b'])
+  })
+
   it('does not mistake a property literally named enum for a keyword', async () => {
     const wireSchema = await sendSchema({
       type: 'object',