fix: close stream adaptive gaps and switch notify to stario v0.1.1

- make stream fast path honor adaptive soft payload limits end-to-end
  - split oversized fast-stream payloads into sequential frames before batching
  - use adaptive soft cap when encoding stream batch payloads
  - move timeout-like error detection into production code for adaptive tx
  - tune notify FrameReader read size explicitly to avoid throughput regression
  - drop local stario replace and depend on released b612.me/stario v0.1.1

security_psk_test.go

@@ -83,6 +83,12 @@ func TestDefaultConstructorsUseModernTransportAfterSetSecretKey(t *testing.T) {
 	sharedKey := []byte("0123456789abcdef0123456789abcdef")
 	client.SetSecretKey(sharedKey)
 	server.SetSecretKey(sharedKey)
+	if client.modernPSKRuntime == nil {
+		t.Fatal("client modernPSKRuntime should be installed after SetSecretKey")
+	}
+	if server.defaultModernPSKRuntime == nil {
+		t.Fatal("server defaultModernPSKRuntime should be installed after SetSecretKey")
+	}
 
 	plain := []byte("notify default modern transport")
 	wire := client.msgEn(client.SecretKey, plain)
@@ -92,6 +98,29 @@ func TestDefaultConstructorsUseModernTransportAfterSetSecretKey(t *testing.T) {
 	}
 }
 
+func TestCustomCodecOverridesClearModernRuntime(t *testing.T) {
+	client := NewClient().(*ClientCommon)
+	server := NewServer().(*ServerCommon)
+	sharedKey := []byte("0123456789abcdef0123456789abcdef")
+	client.SetSecretKey(sharedKey)
+	server.SetSecretKey(sharedKey)
+	if client.modernPSKRuntime == nil || server.defaultModernPSKRuntime == nil {
+		t.Fatal("modern runtimes should be installed before override")
+	}
+
+	client.SetMsgEn(defaultMsgEn)
+	client.SetMsgDe(defaultMsgDe)
+	server.SetDefaultCommEncode(defaultMsgEn)
+	server.SetDefaultCommDecode(defaultMsgDe)
+
+	if client.modernPSKRuntime != nil {
+		t.Fatal("client modernPSKRuntime should be cleared after custom codec override")
+	}
+	if server.defaultModernPSKRuntime != nil {
+		t.Fatal("server defaultModernPSKRuntime should be cleared after custom codec override")
+	}
+}
+
 func TestDefaultConstructorsDecodeSignalEnvelopeWithModernTransport(t *testing.T) {
 	client := NewClient().(*ClientCommon)
 	server := NewServer().(*ServerCommon)