aft_import: organize splits and mis-sorts groups; remove leaves the trailing comment behind #828

AFT: 0.62.0, OpenCode 2.1.4, macOS.

aft_import grouping and comment handling:

1. organize splits and mis-sorts groups (Python). Input:

   import sys
   import os
   import zeta.side  # noqa
   import abc
   from . import rel
   from collections import OrderedDict
   import json

   Result groups: os, sys → zeta.side → collections, abc, json. Stdlib is split around a third-party import, and the second stdlib group isn't sorted.
2. organize leaves relative imports unsorted (TS). With import "./z-side"; import {z} from "./z"; // about y; import {y} from "./y"; import fs…; import "reflect-metadata"; import {x} from "./x"; import path…, ./x moves below the node imports after a blank line while ./z and ./y stay in original order.
3. remove leaves the trailing comment behind. // about y / import { y } from "./y"; // trailing → after op: remove, module: ./y: // about y / // trailing (comment on its own line with a leading space). Expected the trailing comment (and arguably the leading one) to go with the import.

No imports were lost in any case; side-effect imports and comments between imports survived, and add merges into existing named imports correctly.