Add Kiro CLI to ACP provider catalog

Adds Kiro CLI as an opt-in ACP provider catalog entry, plus a generic ACP extension-notification sink so unknown notifications no longer fail JSON-RPC dispatch.

packages/server/src/server/agent/providers/acp-agent.test.ts

@@ -1438,6 +1438,26 @@ describe("ACPAgentSession slash commands", () => {
 });
 
 describe("ACPAgentSession", () => {
+  test("accepts ACP extension notifications without failing the JSON-RPC connection", async () => {
+    const logger = createTestLogger();
+    const trace = vi.spyOn(logger, "trace");
+    const session = createSessionWithConfig({ provider: "kiro" }, logger);
+
+    await expect(
+      session.extNotification("_kiro.dev/session/initialized", {
+        sessionId: "session-1",
+      }),
+    ).resolves.toBeUndefined();
+    expect(trace).toHaveBeenCalledWith(
+      expect.objectContaining({
+        provider: "kiro",
+        method: "_kiro.dev/session/initialized",
+        sessionId: "session-1",
+      }),
+      "provider.acp.extension_notification",
+    );
+  });
+
   test("emits assistant and reasoning chunks as deltas while user chunks stay accumulated", async () => {
     const session = createSession();
     const events: Array<{ type: string; item?: { type: string; text?: string } }> = [];

packages/server/src/server/agent/providers/acp-agent.ts

@@ -1667,6 +1667,19 @@ export class ACPAgentSession implements AgentSession, ACPClient {
     }
   }
 
+  async extNotification(method: string, params: Record<string, unknown>): Promise<void> {
+    this.logger.trace(
+      {
+        agentId: this.agentId,
+        provider: this.provider,
+        sessionId: typeof params.sessionId === "string" ? params.sessionId : undefined,
+        method,
+        rawEvent: params,
+      },
+      "provider.acp.extension_notification",
+    );
+  }
+
   async readTextFile(params: ReadTextFileRequest): Promise<{ content: string }> {
     const raw = await fs.readFile(params.path, "utf8");
     if (!params.line && !params.limit) {