Anchor work decisions to a reserved follow-up run identity

Why: Reconcile interrupted dispatch without spending another model request.

Evidence: Core package tests pass locally; integration exercises acceptance and recovery.

Impact: Add one optional persisted run identifier.

Refs: feature/workbench-flow-completion

activity.go

@@ -39,8 +39,9 @@ type WorkCard struct {
 }
 
 type WorkDecision struct {
-	Mode        string       `json:"mode"`  // single | multiple
-	State       string       `json:"state"` // open | deferred | submitted
+	RunID       ID           `json:"runId,omitempty"` // reserved child identity; reconciles acceptance after restart without rerunning
+	Mode        string       `json:"mode"`            // single | multiple
+	State       string       `json:"state"`           // open | deferred | dispatching | submitted
 	Options     []WorkOption `json:"options,omitempty"`
 	SelectedIDs []string     `json:"selectedIds,omitempty"`
 	FreeText    string       `json:"freeText,omitempty"`

activity_work_test.go

@@ -0,0 +1,46 @@
+package core
+
+import (
+	"encoding/json"
+	"strings"
+	"testing"
+	"time"
+)
+
+func TestWorkCardSurvivesPersistedSnapshot(t *testing.T) {
+	completed := time.Date(2026, 10, 15, 6, 0, 0, 0, time.UTC)
+	card := ActivityCard{ID: "card_work", Status: CardDone, Work: &WorkCard{
+		Result:        strings.Repeat("完整结果\n", 200) + "最后一项依据",
+		ResultVersion: 2, ReadVersion: 1, CompletedAt: &completed,
+		Decision: &WorkDecision{Mode: "multiple", State: "submitted", Options: []WorkOption{{ID: "summary", Label: "生成摘要"}},
+			SelectedIDs: []string{"summary"}, FreeText: "请突出关键限制", RespondedAt: &completed},
+	}}
+	data, err := json.Marshal(card)
+	if err != nil {
+		t.Fatal(err)
+	}
+	var restored ActivityCard
+	if err := json.Unmarshal(data, &restored); err != nil {
+		t.Fatal(err)
+	}
+	if restored.Work == nil || restored.Work.Result != card.Work.Result || restored.Work.ReadVersion != 1 || restored.Work.ResultVersion != 2 {
+		t.Fatalf("complete result or unread version lost: %+v", restored.Work)
+	}
+	if d := restored.Work.Decision; d.State != "submitted" || d.SelectedIDs[0] != "summary" || d.FreeText != "请突出关键限制" || !d.RespondedAt.Equal(completed) {
+		t.Fatalf("decision history lost: %+v", d)
+	}
+}
+
+func TestLegacyCardOmitsOptionalWork(t *testing.T) {
+	var legacy ActivityCard
+	if err := json.Unmarshal([]byte(`{"id":"old","status":"resolved","body":[{"type":"markdown","markdown":"保留历史"}]}`), &legacy); err != nil {
+		t.Fatal(err)
+	}
+	data, err := json.Marshal(legacy)
+	if err != nil {
+		t.Fatal(err)
+	}
+	if legacy.Work != nil || strings.Contains(string(data), `"work"`) || legacy.Body[0].Markdown != "保留历史" {
+		t.Fatalf("legacy payload changed: %s", data)
+	}
+}

ts/types.ts

@@ -158,7 +158,8 @@ export interface WorkCard {
   decision?: WorkDecision;
 }
 export interface WorkDecision {
-  mode: 'single' | 'multiple'; state: 'open' | 'deferred' | 'submitted';
+  runId?: ID;
+  mode: 'single' | 'multiple'; state: 'open' | 'deferred' | 'dispatching' | 'submitted';
   options?: { id: string; label: string }[];
   selectedIds?: string[]; freeText?: string; respondedAt?: string;
 }