fix: add agent context to ws logs

src/gateway/ws-log.test.ts

@@ -29,12 +29,15 @@ describe("gateway ws log helpers", () => {
   test("summarizeAgentEventForWsLog extracts useful fields", () => {
     const summary = summarizeAgentEventForWsLog({
       runId: "12345678-1234-1234-1234-123456789abc",
+      sessionKey: "agent:main:main",
       stream: "assistant",
       seq: 2,
       data: { text: "hello world", mediaUrls: ["a", "b"] },
     });
     expect(summary).toMatchObject({
+      agent: "main",
       run: "12345678…9abc",
+      session: "main",
       stream: "assistant",
       aseq: 2,
       text: "hello world",