test(agents): tighten pi message typing and dedupe malformed tool-call cases

src/agents/compaction.retry.test.ts

@@ -1,4 +1,5 @@
 import type { AgentMessage } from "@mariozechner/pi-agent-core";
+import type { AssistantMessage, UserMessage } from "@mariozechner/pi-ai";
 import type { ExtensionContext } from "@mariozechner/pi-coding-agent";
 import * as piCodingAgent from "@mariozechner/pi-coding-agent";
 import { afterEach, beforeEach, describe, expect, it, vi } from "vitest";
@@ -24,10 +25,30 @@ describe("compaction retry integration", () => {
     vi.clearAllTimers();
     vi.useRealTimers();
   });
-  const testMessages = [
-    { role: "user", content: "Test message" },
-    { role: "assistant", content: "Test response" },
-  ] as unknown as AgentMessage[];
+  const testMessages: AgentMessage[] = [
+    {
+      role: "user",
+      content: "Test message",
+      timestamp: 1,
+    } satisfies UserMessage,
+    {
+      role: "assistant",
+      content: [{ type: "text", text: "Test response" }],
+      api: "openai-responses",
+      provider: "openai",
+      model: "gpt-5.2",
+      usage: {
+        input: 0,
+        output: 0,
+        cacheRead: 0,
+        cacheWrite: 0,
+        totalTokens: 0,
+        cost: { input: 0, output: 0, cacheRead: 0, cacheWrite: 0, total: 0 },
+      },
+      stopReason: "stop",
+      timestamp: 2,
+    } satisfies AssistantMessage,
+  ];
 
   const testModel = {
     provider: "anthropic",