fix-codegen-imports

# Fix codegen imports `butcher apply` sometimes emits modules that reference a name it never imported (usually a new enum, or `Enum` itself). Ruff catches all of them as F821. ## Steps 1. List the offenders: ```bash rtk ruff check --preview --output-format=concise aiogram examples ``` Only `F821 Undefined name` findings are in scope. Anything else is a real bug — report it, don't patch it. 2. For each undefined name, copy the import from a sibling module that already uses the same kind of symbol — do not invent a new style: | Undefined name | Fix | Reference file | |---|---|---| | `Enum` in `aiogram/enums/*.py` | `from enum import Enum` as the first line | `aiogram/enums/chat_action.py` | | An enum in `aiogram/types/*.py` or `aiogram/methods/*.py` | `from ..enums import <Name>`, placed above the `from .` imports | `aiogram/types/input_paid_media_photo.py` | | A type in `aiogram/types/*.py` | `from .<snake_case_module> import <Name>` | any sibling type | If the module has annotations referencing types only imported under `TYPE_CHECKING`, it also needs `from __future__ import annotations` as the first line — generated modules that quote forward refs all have it. 3. Verify: ```bash rtk ruff format aiogram rtk ruff check --preview aiogram examples rtk mypy aiogram ``` ## Follow-up These files are generated. A hand-fix survives only until the next `butcher apply all`. After the branch is green, tell the user the durable fix belongs in `.butcher` (template / entity config for the symbol whose import was dropped) so regeneration stops losing it.