feat(store): persist and read back the reconciliation

CompleteUpload writes it (SQL NULL when there was none, never the JSON text 'null':
the page claims a second opinion only if the column is non-NULL); GetUpload reads it,
List does not. Mutation-checked.

domain.go and the store are one commit: the store tests need the new field.

Co-Authored-By: Claude Sonnet 5.5 <noreply@anthropic.com>

internal/adapters/store/uploaded_transcripts.go

@@ -52,12 +52,20 @@ func (s *Store) CompleteUpload(ctx context.Context, userID, id string, t domain.
 	if err != nil {
 		return fmt.Errorf("store: complete upload: marshal segments: %w", err)
 	}
+	// A nil Reconciliation must be SQL NULL, not the JSON text "null": the page decides
+	// whether to claim a second opinion by whether this column is NULL.
+	var rec []byte
+	if t.Reconciliation != nil {
+		if rec, err = json.Marshal(t.Reconciliation); err != nil {
+			return fmt.Errorf("store: complete upload: marshal reconciliation: %w", err)
+		}
+	}
 	return s.updateUpload(ctx, userID, id, "complete upload",
 		`UPDATE uploaded_transcripts
 		    SET status = 'done', content = $3, segments = $4, endpoint = $5,
-		        audio_seconds = $6, error_kind = NULL, finished_at = NOW()
+		        audio_seconds = $6, reconciliation = $7, error_kind = NULL, finished_at = NOW()
 		  WHERE id = $1 AND user_id = $2`,
-		t.Text, segs, t.Endpoint, t.AudioSeconds)
+		t.Text, segs, t.Endpoint, t.AudioSeconds, rec)
 }
 
 // FailUpload moves an upload to failed with a typed reason.
@@ -157,19 +165,19 @@ func (s *Store) FailInterruptedUploads(ctx context.Context) (int, error) {
 }
 
 const uploadSelect = `SELECT id, user_id, title, status, content, segments, endpoint,
-       audio_seconds, error_kind, had_video, created_at, finished_at FROM uploaded_transcripts`
+       audio_seconds, error_kind, had_video, reconciliation, created_at, finished_at FROM uploaded_transcripts`
 
 // scanUpload scans one uploadSelect row. withText controls whether the transcript
 // body and segments are kept (GetUpload) or dropped (ListUploads).
 func scanUpload(row pgx.Row, u *domain.UploadedTranscript, withText bool) error {
 	var (
 		status, errKind, endpoint, content *string
-		segments                           []byte
+		segments, reconciliation           []byte
 		seconds                            *float64
 		finished                           *time.Time
 	)
 	if err := row.Scan(&u.ID, &u.UserID, &u.Title, &status, &content, &segments, &endpoint,
-		&seconds, &errKind, &u.HadVideo, &u.CreatedAt, &finished); err != nil {
+		&seconds, &errKind, &u.HadVideo, &reconciliation, &u.CreatedAt, &finished); err != nil {
 		return err
 	}
 	u.Status = domain.UploadStatus(deref(status))
@@ -184,6 +192,13 @@ func scanUpload(row pgx.Row, u *domain.UploadedTranscript, withText bool) error
 	if !withText {
 		return nil
 	}
+	if len(reconciliation) > 0 {
+		var r domain.Reconciliation
+		if err := json.Unmarshal(reconciliation, &r); err != nil {
+			return fmt.Errorf("unmarshal reconciliation: %w", err)
+		}
+		u.Reconciliation = &r
+	}
 	u.Content = deref(content)
 	if len(segments) > 0 {
 		if err := json.Unmarshal(segments, &u.Segments); err != nil {

internal/domain/domain.go

@@ -215,6 +215,9 @@ type UploadedTranscript struct {
 	// was used and the video was discarded; the page says so. It is set at upload
 	// and never cleared (ADR-033).
 	HadVideo bool
+	// Reconciliation is how a merged transcript came about, or nil for a single
+	// engine (ADR-034). Set by Get, not by List.
+	Reconciliation *Reconciliation
 	CreatedAt      time.Time
 	FinishedAt     time.Time // zero until the job reaches done or failed
 }