fix(connect): forward complex message payloads (#612)

Remove content-shape and message-type attachment filtering, recover forwarded unknown attachments, and preserve original media across all agent backends.

internal/helpers/connect_attachment_prepare_test.go

@@ -0,0 +1,75 @@
+// Copyright 2026 Alibaba Group
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//     http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+package helpers
+
+import (
+	"context"
+	"os"
+	"path/filepath"
+	"strings"
+	"testing"
+)
+
+func TestPrepareOpenCodeAttachmentsUsesStoryboardAndTranscript(t *testing.T) {
+	previous := generateConnectVideoStoryboard
+	t.Cleanup(func() { generateConnectVideoStoryboard = previous })
+	storyboard := filepath.Join(t.TempDir(), "storyboard.jpg")
+	if err := os.WriteFile(storyboard, []byte("jpeg"), 0o600); err != nil {
+		t.Fatal(err)
+	}
+	generateConnectVideoStoryboard = func(_ context.Context, path string) (string, error) {
+		if path != "/tmp/original.mov" {
+			t.Fatalf("video path = %q", path)
+		}
+		return storyboard, nil
+	}
+
+	prompt, attachments := prepareOpenCodeAttachments(context.Background(),
+		"视频路径 /tmp/original.mov；语音路径 /tmp/original.ogg；转写：你是谁？",
+		[]connectMediaAttachment{
+			{LocalPath: "/tmp/picture.jpg", FileName: "picture.jpg", MediaType: "image"},
+			{LocalPath: "/tmp/original.ogg", FileName: "voice.ogg", MediaType: "audio"},
+			{LocalPath: "/tmp/original.mov", FileName: "demo.mov", MediaType: "video"},
+			{LocalPath: "/tmp/report.md", FileName: "report.md", MediaType: "file"},
+		},
+	)
+	if len(attachments) != 3 {
+		t.Fatalf("attachments = %#v, want image + video storyboard + file (audio omitted)", attachments)
+	}
+	if attachments[0].LocalPath != "/tmp/picture.jpg" || attachments[1].LocalPath != storyboard || attachments[1].MediaType != "image" || attachments[2].LocalPath != "/tmp/report.md" {
+		t.Fatalf("attachments = %#v", attachments)
+	}
+	if strings.Contains(prompt, "/tmp/original.mov") || strings.Contains(prompt, "/tmp/original.ogg") {
+		t.Fatalf("prompt still points OpenCode at unsupported original binary: %q", prompt)
+	}
+	for _, want := range []string{storyboard, "12 帧", "钉钉转写", "你是谁？"} {
+		if !strings.Contains(prompt, want) {
+			t.Fatalf("prompt missing %q: %q", want, prompt)
+		}
+	}
+}
+
+func TestPrepareOpenCodeAttachmentsDoesNotSubmitVideoWhenStoryboardFails(t *testing.T) {
+	previous := generateConnectVideoStoryboard
+	t.Cleanup(func() { generateConnectVideoStoryboard = previous })
+	generateConnectVideoStoryboard = func(context.Context, string) (string, error) {
+		return "", os.ErrNotExist
+	}
+	prompt, attachments := prepareOpenCodeAttachments(context.Background(), "请看视频", []connectMediaAttachment{
+		{LocalPath: "/tmp/original.mov", FileName: "demo.mov", MediaType: "video"},
+	})
+	if len(attachments) != 0 || !strings.Contains(prompt, "未能读取视频画面") {
+		t.Fatalf("prompt=%q attachments=%#v", prompt, attachments)
+	}
+}