fix: make artifact projection durable

tests/unit/agent-hooks.test.ts

@@ -0,0 +1,28 @@
+import { describe, expect, it, vi } from "vitest";
+import { buildAgentHooks } from "../../src/main/agent-runtime/agent-hooks";
+import type { WorkerRpcClient } from "../../src/main/worker/entry/rpc";
+
+function createRpc(response: { ok: true; result: unknown } | { ok: false; error: string }) {
+  return {
+    invoke: vi.fn(async () => response),
+  } as unknown as WorkerRpcClient & { invoke: ReturnType<typeof vi.fn> };
+}
+
+describe("agent hook RPC policy", () => {
+  it("fails afterToolCall when main cannot acknowledge artifact projection", async () => {
+    const rpc = createRpc({ ok: false, error: "RuntimeBridge unavailable" });
+    const hooks = buildAgentHooks({
+      runId: "11111111-1111-4111-8111-111111111111",
+      rpc,
+    });
+
+    await expect(
+      hooks.afterToolCall({
+        toolCall: { name: "write", id: "tool-call-1" },
+        args: { path: "report.md" },
+        result: { content: [], details: null },
+        isError: false,
+      } as unknown as Parameters<typeof hooks.afterToolCall>[0]),
+    ).rejects.toThrow("afterToolCall RPC failed: RuntimeBridge unavailable");
+  });
+});