Structural method replacement can commit invalid indentation

[isty2e]

Environment

• identedit 0.4.0

Reproduction

example.py:

class Example:
    def first(self) -> None:
        pass

    def target(self) -> None:
        pass

    def after(self) -> None:
        pass

replacement.py:

    def target(self) -> None:
        print("replacement")

Run:

identedit patch example.py \
  --symbol Example.target \
  --replace \
  --text-file replacement.py

identedit reports:

{
  "summary": {
    "files_modified": 1,
    "operations_applied": 1,
    "operations_failed": 0
  },
  "transaction": {
    "mode": "all_or_nothing",
    "status": "committed"
  }
}

The result is syntactically invalid:

class Example:
    def first(self) -> None:
        pass

        def target(self) -> None:
        print("replacement")

    def after(self) -> None:
        pass

python -m py_compile example.py raises IndentationError.

Expected

Either:

1. normalize a method replacement snippet relative to the target container, or
2. reject the indented snippet without modifying the file.

At minimum, structural patch application should parse-check the resulting file and roll back instead of reporting a committed all-or-nothing transaction for invalid syntax.