feat(app): wire projectinstance duties into bizdev

Composition-root adapter maps live instance DocTasks to bizdev's narrow
InstanceDutySource without crossing module boundaries.

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

internal/app/app.go

@@ -222,6 +222,7 @@ func Assemble(cfg *config.Config, svc *bizdev.Service) (*Runtime, error) {
 	})
 	if instSvc != nil {
 		instSvc.SetAuthorOnlyPolicySource(&sysadminAuthorOnlyPolicyAdapter{svc: rt.SysAdmin})
+		svc.SetInstanceDutySource(&projectInstanceDutyAdapter{inst: instSvc})
 	}
 	rt.DocNotify = &docnotify.Subscriber{Notify: rt.Notify, Docs: parts.Gov}
 	rt.DocNotify.SkipWrite = func(ctx context.Context) bool {

internal/app/instance_duty_adapter.go

@@ -0,0 +1,46 @@
+package app
+
+import (
+	"context"
+	"strings"
+
+	"chat-agent-system/internal/projectinstance"
+)
+
+// projectInstanceDutyAdapter 将活跃工作流实例的逐文档职责投影为 bizdev 窄接口，
+// 避免 bizdev 导入 projectinstance。
+type projectInstanceDutyAdapter struct {
+	inst *projectinstance.Service
+}
+
+func (a *projectInstanceDutyAdapter) ResolveGovernedDuty(ctx context.Context, projectID int64, taskKey string) (author, reviewer, approver int64, dutyPolicy string, governed bool, err error) {
+	if a == nil || a.inst == nil || projectID <= 0 {
+		return 0, 0, 0, "", false, nil
+	}
+	taskKey = strings.TrimSpace(taskKey)
+	if taskKey == "" {
+		return 0, 0, 0, "", false, nil
+	}
+	detail, _, derr := a.inst.GetLiveInstanceDetail(ctx, projectID)
+	if derr != nil || detail == nil {
+		// 无活跃实例（规划中/legacy）→ 不受治理，非错误
+		return 0, 0, 0, "", false, nil
+	}
+	for _, st := range detail.Instance.ConfigSnapshot.Stages {
+		for _, dt := range st.DocTasks {
+			if dt.TaskKey != taskKey || !dt.Enabled {
+				continue
+			}
+			mode, effective, isAuthorOnly := projectinstance.ResolveDocTaskDuty(dt)
+			if mode != projectinstance.DutyModeFull {
+				return 0, 0, 0, "", false, nil
+			}
+			policy := projectinstance.DutyPolicySeparated
+			if isAuthorOnly {
+				policy = projectinstance.DutyPolicyAuthorOnly
+			}
+			return effective.AuthorUserID, effective.ReviewerUserID, effective.ApproverUserID, policy, true, nil
+		}
+	}
+	return 0, 0, 0, "", false, nil
+}