fix: harden module lifecycle and debug log setup

Export CurrentDialect(), return setup errors when debug logger is not
registered, and guard DestName logging when the module is uninitialized.

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

module.go

@@ -45,6 +45,11 @@ var (
 	state = dbState{}
 )
 
+// CurrentDialect returns the SQL dialect configured by [ModuleDB].
+func CurrentDialect() Dialect {
+	return state.dialect
+}
+
 // SQLO returns the current SQL database handle.
 func SQLO() *sql.DB {
 	dbxshared.DBModule.RequireLoaded("dbx.SQLO requires database module")
@@ -118,7 +123,10 @@ func setupDB(m *app.Module) error {
 	)
 
 	if state.debugLog {
-		dbxshared.InitLogger(state.dialect)
+		if err := dbxshared.InitLogger(state.dialect); err != nil {
+			m.Logger().Error("Couldn't initialize Jet query debug logger", "err", err)
+			return err
+		}
 	}
 
 	return nil