fix(hitl): keep the diagnosis in the HITL ledger so edited messages retain evidence and rationale

버튼 처리·만료 후 메시지를 편집할 때 빈 진단으로 다시 그려 증거·근거 필드가 "-"로 지워지던
결함을 고친다. ai.hitl_messages에 diagnosis jsonb를 추가해 게시 시점의 진단을 저장하고
편집 시 그대로 재사용한다.

ai/internal/hitl/bot.go

@@ -131,7 +131,7 @@ func (b *Bot) Post(ctx context.Context, req PostRequest) error {
 	if err != nil {
 		return err
 	}
-	if err := b.store.InsertHitl(ctx, rag.HitlMessage{Token: req.Token, ChannelID: msg.ChannelID, MessageID: msg.ID, ActionID: req.ActionID, Target: req.Target, RunID: req.RunID, ScenarioID: req.ScenarioID, SessionID: req.SessionID, ExpiresAt: expires}); err != nil {
+	if err := b.store.InsertHitl(ctx, rag.HitlMessage{Token: req.Token, ChannelID: msg.ChannelID, MessageID: msg.ID, ActionID: req.ActionID, Target: req.Target, Diagnosis: req.Diagnosis, RunID: req.RunID, ScenarioID: req.ScenarioID, SessionID: req.SessionID, ExpiresAt: expires}); err != nil {
 		return err
 	}
 	b.arm(req.Token, time.Until(expires))
@@ -217,14 +217,9 @@ func (b *Bot) Decide(ctx context.Context, token, decision, by string) (string, e
 	return "", fmt.Errorf("unknown decision %s", decision)
 }
 
+// edit re-renders the original message with the stored diagnosis, the new status and disabled buttons.
 func (b *Bot) edit(m *rag.HitlMessage, status string, color int, result map[string]any) error {
-	ctx := context.Background()
+	em := embedFor(m.Diagnosis, m.ActionID, m.Target, m.RunID, m.ScenarioID, status, color)
-	d := map[string]any{}
-	if se, err := b.store.GetHitl(ctx, m.Token); err == nil {
-		m = se
-	}
-	em := embedFor(d, m.ActionID, m.Target, m.RunID, m.ScenarioID, status, color)
-	em.Fields = em.Fields[1:] // the diagnosis fields are already in the original message; keep the edit compact
 	if result != nil {
 		rb, _ := json.Marshal(result)
 		em.Fields = append(em.Fields, &discordgo.MessageEmbedField{Name: "Result", Value: "```json\n" + truncate(string(rb), 900) + "\n```"})

ai/internal/rag/store.go

@@ -57,6 +57,7 @@ CREATE TABLE IF NOT EXISTS ai.hitl_messages (
   message_id  text NOT NULL,
   action_id   text NOT NULL,
   target      jsonb NOT NULL DEFAULT '{}'::jsonb,
+  diagnosis   jsonb NOT NULL DEFAULT '{}'::jsonb,
   run_id      text,
   scenario_id text,
   session_id  text,
@@ -302,6 +303,7 @@ type HitlMessage struct {
 	MessageID  string
 	ActionID   string
 	Target     map[string]any
+	Diagnosis  map[string]any
 	RunID      *string
 	ScenarioID *string
 	SessionID  string
@@ -313,20 +315,22 @@ type HitlMessage struct {
 
 func (s *Store) InsertHitl(ctx context.Context, m HitlMessage) error {
 	t, _ := json.Marshal(m.Target)
-	_, err := s.pool.Exec(ctx, `INSERT INTO ai.hitl_messages (token,channel_id,message_id,action_id,target,run_id,scenario_id,session_id,expires_at)
+	d, _ := json.Marshal(m.Diagnosis)
-	  VALUES ($1,$2,$3,$4,$5,$6,$7,$8,$9)`, m.Token, m.ChannelID, m.MessageID, m.ActionID, t, m.RunID, m.ScenarioID, m.SessionID, m.ExpiresAt)
+	_, err := s.pool.Exec(ctx, `INSERT INTO ai.hitl_messages (token,channel_id,message_id,action_id,target,diagnosis,run_id,scenario_id,session_id,expires_at)
+	  VALUES ($1,$2,$3,$4,$5,$6,$7,$8,$9,$10)`, m.Token, m.ChannelID, m.MessageID, m.ActionID, t, d, m.RunID, m.ScenarioID, m.SessionID, m.ExpiresAt)
 	return err
 }
 
 func (s *Store) GetHitl(ctx context.Context, token string) (*HitlMessage, error) {
 	var m HitlMessage
-	var t []byte
+	var t, d []byte
-	err := s.pool.QueryRow(ctx, `SELECT token,channel_id,message_id,action_id,target,run_id,scenario_id,COALESCE(session_id,''),expires_at,decided_at,decision,decided_by FROM ai.hitl_messages WHERE token=$1`, token).
+	err := s.pool.QueryRow(ctx, `SELECT token,channel_id,message_id,action_id,target,diagnosis,run_id,scenario_id,COALESCE(session_id,''),expires_at,decided_at,decision,decided_by FROM ai.hitl_messages WHERE token=$1`, token).
-		Scan(&m.Token, &m.ChannelID, &m.MessageID, &m.ActionID, &t, &m.RunID, &m.ScenarioID, &m.SessionID, &m.ExpiresAt, &m.DecidedAt, &m.Decision, &m.DecidedBy)
+		Scan(&m.Token, &m.ChannelID, &m.MessageID, &m.ActionID, &t, &d, &m.RunID, &m.ScenarioID, &m.SessionID, &m.ExpiresAt, &m.DecidedAt, &m.Decision, &m.DecidedBy)
 	if err != nil {
 		return nil, err
 	}
 	_ = json.Unmarshal(t, &m.Target)
+	_ = json.Unmarshal(d, &m.Diagnosis)
 	return &m, nil
 }