Added full support for the Bot API 9.6 (#1792)

* Added full support for the Bot API 9.6

* Add support for `managed_bot` updates

* Set `description_parse_mode` default to `"parse_mode"` and use `DateTime` for `addition_date` in `PollOption`

* Update changelog with features and changes from Bot API 9.6

* Add changelog fragment generator and update poll parameter descriptions

.serena/memories/code_style.md

@@ -0,0 +1,42 @@
+# Code Style & Conventions
+
+## General
+- `from __future__ import annotations` at the top of every Python file
+- Full type hints on all function signatures and class fields
+- Max line length: **99** characters (ruff enforced)
+- snake_case for Python names; camelCase used only in `__api_method__` strings
+
+## Pydantic models
+- All Telegram types extend `TelegramObject(BotContextController, BaseModel)` from `aiogram/types/base.py`
+- `TelegramObject` is frozen; use `MutableTelegramObject` when mutation is needed
+- Fields default to `None` for optional API parameters; use `Field(None, json_schema_extra={"deprecated": True})` for deprecated fields
+- Use `Default("key")` sentinel (from `aiogram.client.default`) for user-configurable defaults like `parse_mode`, `protect_content`
+- `TYPE_CHECKING` guards for circular imports — keep runtime imports lean
+
+## API Methods
+- Each method is a class inheriting `TelegramMethod[ReturnType]` from `aiogram/methods/base.py`
+- Required class attrs: `__returning__` (return type), `__api_method__` (camelCase string)
+- Fields with `None` default = optional param
+- Method docstring format: short description + `Source: https://core.telegram.org/bots/api#methodname`
+- File name: snake_case of method name (e.g., `SendMessage` → `send_message.py`)
+
+## Imports order (ruff/isort enforced)
+1. stdlib
+2. third-party
+3. `aiogram` (first-party)
+4. relative imports
+
+## Ruff rules enforced
+- A (annotations), B (bugbear), C4 (comprehensions), DTZ (datetimez), E, F, I (isort), PERF, PL (pylint), Q (quotes), RET, SIM, T10, T20, UP (pyupgrade)
+- Several PLR rules disabled (Telegram API naturally has many params/methods)
+- `F401` disabled (re-exports in `__init__.py` intentional)
+
+## Code generation convention
+- **Never hand-edit generated files** (`.butcher/**/entity.json`, auto-generated `aiogram/types/*.py`, `aiogram/methods/*.py`, `aiogram/enums/*.py`)
+- Add features via `.butcher` YAML config/aliases + templates, then regenerate
+- After codegen: always run lint + mypy
+
+## Naming patterns
+- Enums: PascalCase class, UPPER_SNAKE members (e.g., `ContentType.TEXT`)
+- Test files: `test_<module_name>.py`
+- Test classes: `Test<ClassName>` with `async def test_<scenario>(self, bot: MockedBot)`