Fail closed on unsupported Rust schema constructs

crates/remora-contracts/tests/generated_wire.rs

@@ -50,6 +50,20 @@ fn generated_roots_reject_governance_regressions() {
         "occurred_at": "2026-07-15T00:00:00Z",
         "unexpected": true
     }));
+    let paths: Vec<Value> = (0..=10_000)
+        .map(|index| Value::String(format!("file-{index}")))
+        .collect();
+    assert_invalid::<JobSubmission>(json!({
+        "source": {
+            "kind": "hugging_face",
+            "repository_type": "model",
+            "repository_id": "owner/repository",
+            "revision": "main",
+            "selection": {
+                "paths": paths
+            }
+        }
+    }));
 }
 
 fn assert_all<T: DeserializeOwned>(values: &Value) {