Add constructor regression for malformed llm payloads

Co-authored-by: Shri Sukhani <shrisukhani@users.noreply.github.com>

Author: cursoragent

currentState.md

@@ -150,6 +150,7 @@ HyperAgent exposes a TypeScript SDK for browser automation with three primary pa
 - Hardened wait-listener lifecycle cleanup against trap-prone session listener-method getters, preserving settle completion while emitting sanitized detach diagnostics.
 - Expanded settle-flow listener regressions to cover trap-prone `session.on` getters, ensuring timeout-based fallback remains deterministic under unreadable listener APIs.
 - Hardened constructor LLM validation to reject malformed non-provider/non-client `llm` payloads instead of accepting invalid runtime objects, while preserving trap-safe config reads.
+- Added explicit constructor regression coverage for malformed partial `llm` objects to lock in fail-fast configuration behavior.
 - Hardened prompt final-goal rendering against malformed/trap-prone task inputs by normalizing non-string goals into bounded readable diagnostics instead of throwing.
 - Hardened prompt base-message materialization with trap-safe array reads so malformed/trap-prone seed message arrays no longer crash message assembly and readable entries are preserved.
 - Hardened constructor custom-action ingestion with trap-safe array reads so unreadable custom-action entries are skipped while valid entries continue to register.

src/agent/__tests__/hyperagent-constructor.test.ts

@@ -134,6 +134,19 @@ describe("HyperAgent constructor and task controls", () => {
     }
   });
 
+  it("throws readable error for malformed llm payloads", () => {
+    expect(
+      () =>
+        new HyperAgent({
+          llm: {
+            invoke: async () => ({ role: "assistant", content: "ok" }),
+          } as unknown as HyperAgentLLM,
+        })
+    ).toThrow(
+      "Invalid llm configuration: expected provider config or HyperAgentLLM client"
+    );
+  });
+
   it("continues constructor when customActions length getter traps", () => {
     const trappedCustomActions = new Proxy(
       [