fix matchmaking session startup forwarding

scripts/course-matchmaking-routes.test.ts

@@ -33,6 +33,12 @@ try {
   assert.ok(calls[0]?.url.endsWith("/a2a/tasks"));
   assert.equal(calls[0]?.headers.get("authorization"), config.a2aAllowedKey ? `Bearer ${config.a2aAllowedKey}` : null);
 
+  calls.length = 0;
+  const sessionStartResponse = await app.request("http://backend.test/matchmaking/a2a", { method: "POST", headers: { "content-type": "application/json" }, body: JSON.stringify({ action: "session_start", params: { page: "job-matching" } }) });
+  assert.equal(sessionStartResponse.status, 200);
+  assert.equal(calls[0]?.body.action, "session_start");
+  assert.equal(calls[0]?.body.session_start, true);
+
   const forbiddenResponse = await app.request("http://backend.test/matchmaking/a2a", { method: "POST", headers: { "content-type": "application/json" }, body: JSON.stringify({ action: "force_forbidden" }) });
   assert.equal(forbiddenResponse.status, 502);
   assert.match(await forbiddenResponse.text(), /matchmaking service authentication failed/);

src/routes/services.ts

@@ -388,6 +388,7 @@ async function callMatchmakingA2a(body: Record<string, unknown>, userId: string)
     ...body,
     action: action === "get_feed" ? "get_scout_feed" : action,
     user_id: getString(body.user_id) ?? userId,
+    session_start: action === "session_start" || body.session_start === true,
   };
   const startedAt = Date.now();
   let res: Response;