[2Zest]

Summary

• Prefer the forward comparison method when operands have the same type, matching Python's runtime dispatch order.
• Add a regression test for inherited lt and subclass-defined gt methods.

Testing

• PYTEST_DISABLE_PLUGIN_AUTOLOAD=1 python -m pytest -o addopts="" mypy/test/testcheck.py::TypeCheckSuite::check-expressions.test (203 passed)
• python -m ruff check mypy/operators.py
• git diff --check

Fixes #22386

[github-actions]

Diff from mypy_primer, showing the effect of this PR on open source code:

spark (https://github.com/apache/spark)
+ python/pyspark/core/rdd.py:2346: error: Unsupported left operand type for > ("S")  [operator]

pandas (https://github.com/pandas-dev/pandas)
+ pandas/core/indexes/datetimelike.py:503: error: Unsupported left operand type for > ("Resolution")  [operator]