feat: add in-process adapter research contract

internal/tools/send_message_broute_adapter_test.go

@@ -53,3 +53,32 @@ func TestBRouteSendMessageConnectorDryRunContract(t *testing.T) {
 		t.Fatalf("unexpected dry-run result: %+v", result)
 	}
 }
+
+func TestBRouteSendMessageConnectorInProcessContract(t *testing.T) {
+	connector := NewBRouteSendMessageConnector(BRouteSendAdapterConfig{Mode: "in_process_contract"})
+	result, err := connector.ExecuteSendMessage(context.Background(), SendMessageConnectorRequest{
+		TargetType:           "direct",
+		TargetID:             "u1",
+		TargetRef:            "contact:u1",
+		ContentText:          "hello",
+		ContentSHA256:        strings.Repeat("a", 64),
+		ContentLength:        5,
+		IdempotencyKeySHA256: strings.Repeat("b", 64),
+		ExecutionMode:        "production",
+	})
+	if err != nil {
+		t.Fatalf("in_process_contract should be a structured blocked result, not process error: %v", err)
+	}
+	if result.Accepted || result.ProductionEnabled {
+		t.Fatalf("contract mode must not accept production send: %+v", result)
+	}
+	if result.Status != "blocked" || result.ErrorCode != "broute_in_process_contract_only" {
+		t.Fatalf("unexpected contract result: %+v", result)
+	}
+	if result.ConnectorMode != "broute-in-process-contract" {
+		t.Fatalf("connector mode = %q", result.ConnectorMode)
+	}
+	if result.SideEffects["sent_message"] != false || result.SideEffects["attached_hook"] != false {
+		t.Fatalf("contract mode must report no side effects: %#v", result.SideEffects)
+	}
+}