Separate the window sentence from the wrapped error so a bad certificate file is not reported as a key mismatch.

Co-authored-by: Cursor <cursoragent@cursor.com>

station/protocol2_test.go

@@ -120,7 +120,10 @@ func TestUDPLimitRunsBeforeAnyDatagram(t *testing.T) {
 	}
 	ctx, cancel := context.WithCancel(t.Context())
 	defer cancel()
-	go func() { _ = st.Run(ctx) }()
+	go func() {
+		// Run's error is observed through State, which is the station seam.
+		_ = st.Run(ctx)
+	}()
 	refl.accept(t)
 	declineTo2(t, refl)
 	for step := 0; step < 6; step++ {
@@ -156,7 +159,10 @@ func TestOversizedFrameBeforeAuthRetries(t *testing.T) {
 	}
 	ctx, cancel := context.WithCancel(t.Context())
 	defer cancel()
-	go func() { _ = st.Run(ctx) }()
+	go func() {
+		// Run's error is observed through State, which is the station seam.
+		_ = st.Run(ctx)
+	}()
 	refl.accept(t)
 	declineTo2(t, refl)
 	payload := make([]byte, 65)
@@ -187,7 +193,10 @@ func TestApplicationMessageBeforeLoginRetries(t *testing.T) {
 	}
 	ctx, cancel := context.WithCancel(t.Context())
 	defer cancel()
-	go func() { _ = st.Run(ctx) }()
+	go func() {
+		// Run's error is observed through State, which is the station seam.
+		_ = st.Run(ctx)
+	}()
 	refl.accept(t)
 	declineTo2(t, refl)
 	refl.writeFrame(t, 100, serverInfo(1, nil, []string{"OPUS"}))