Enums with custom __init__ cannot be imported under mutmut: KeyError: '_mutmut_orig' #600

My project has enums with a custom __init__, and mutmut run stops at the stats run because the mutated module cannot be imported.

Enum calls __init__ once per member while the class is still being created, before the trampoline table of its methods is assigned after the class body. __new__ is already in NEVER_MUTATE_FUNCTION_NAMES for that reason.

Skipping __init__ and _generate_next_value_ on an enum class the same way works for me. Shall I submit a PR?

Reproducer

mutmut 3.8.0, pytest 9.1.1, Python 3.15, mutmut run:

File ".../mutmut/mutation/trampoline.py", line 75, in trampoline
  orig_func = mutants_dict["_mutmut_orig"]
KeyError: '_mutmut_orig'
ERROR tests/test_color.py - KeyError: '_mutmut_orig'
failed to collect stats. runner returned 2

src/color.py:

from enum import Enum


class Color(Enum):
    RED = 1

    def __init__(self, value):
        self.label = f"c{value}"

tests/test_color.py:

from color import Color


def test_label():
    assert Color.RED.label == "c1"

pyproject.toml:

[tool.mutmut]
source_paths = ["src"]

[tool.pytest.ini_options]
pythonpath = ["src"]