feat(runtime): IM 主人私聊补历史转录（与 Web 主会话同源：抽共享 transcript 包 + OwnerEnvFor 单入口）

internal/services/gateway/session_document_status_test.go

@@ -13,6 +13,7 @@ import (
 	"git.yeij.top/AskaEth/Cyrene_v2/internal/runtime/history"
 	"git.yeij.top/AskaEth/Cyrene_v2/internal/runtime/loop"
 	"git.yeij.top/AskaEth/Cyrene_v2/internal/runtime/model"
+	"git.yeij.top/AskaEth/Cyrene_v2/internal/runtime/transcript"
 )
 
 // 本文件是 S3.5 两个契约缺口的回归测试（design/24 §6.1、§9.7）：
@@ -80,7 +81,7 @@ func TestTranscriptRestoresAllDocumentParts(t *testing.T) {
 	if len(recent) != 1 {
 		t.Fatalf("recent = %+v, want 1 条", recent)
 	}
-	parts := chatDocumentsOf([]model.Message{transcriptMessage(recent[0])})
+	parts := chatDocumentsOf([]model.Message{transcript.Message(recent[0])})
 	if len(parts) != 3 {
 		t.Fatalf("还原出的文档部件 = %d 个, want 3（全部附件都要回到上下文）", len(parts))
 	}
@@ -100,7 +101,7 @@ func TestTranscriptRestoresLegacySingleObjectColumn(t *testing.T) {
 	t.Parallel()
 	const legacy = `{"name":"aaaabbbbccccdddd.txt","mime":"text/plain","size":1234,"status":"extracted"}`
 	parts := chatDocumentsOf([]model.Message{
-		transcriptMessage(history.Message{ID: "m1", Role: history.RoleUser, Content: "旧行", Document: legacy}),
+		transcript.Message(history.Message{ID: "m1", Role: history.RoleUser, Content: "旧行", Document: legacy}),
 	})
 	if len(parts) != 1 || parts[0].DocumentName != "aaaabbbbccccdddd.txt" {
 		t.Fatalf("旧单对象列还原出 = %+v, want 那一条引用", parts)