Feat v0.6.3 dead code sweep (#38)

Co-authored-by: Jeffrey Smith <jasafpro@gmail.com>
Co-committed-by: Jeffrey Smith <jasafpro@gmail.com>

server/store/postgres/workflows.go

@@ -404,7 +404,7 @@ func nullIfEmpty(s string) interface{} {
 	return s
 }
 
-// ── Instances (v0.3.1) ──────────────────────
+// ── Instances ──────────────────────
 
 func (s *WorkflowStore) CreateInstance(ctx context.Context, inst *models.WorkflowInstance) error {
 	stageData := jsonOrEmpty(inst.StageData)
@@ -573,7 +573,7 @@ func (s *WorkflowStore) ListActiveInstances(ctx context.Context) ([]models.Workf
 	return result, rows.Err()
 }
 
-// ── Assignments (v0.3.1) ────────────────────
+// ── Assignments ────────────────────
 
 func (s *WorkflowStore) CreateAssignment(ctx context.Context, a *models.WorkflowAssignment) error {
 	reviewData := jsonOrEmpty(a.ReviewData)
@@ -661,7 +661,7 @@ func (s *WorkflowStore) ListAssignmentsByUser(ctx context.Context, userID string
 	return s.queryAssignments(ctx, q, args...)
 }
 
-// ── Signoffs (v0.3.4) ─────────────────────────
+// ── Signoffs ─────────────────────────
 
 func (s *WorkflowStore) CreateSignoff(ctx context.Context, so *models.WorkflowSignoff) error {
 	return DB.QueryRowContext(ctx, `