fix: require pure Python forwarding shape

[ApexWorm]

Problem

The Python passthrough detector relied on textual param=param matches, which labels decorated command entrypoints, functions that construct requests, and typed dataclass fixture factories as high-confidence redundant wrappers.

Fix

Parse Python modules and only report undecorated top-level functions whose body is an optional docstring plus one return that directly forwards parameters to a statically rooted, non-constructor call target. This preserves genuine lower-case forwarding aliases while rejecting multi-step functions, nested request construction, dynamic receivers, and Capitalized class-constructor factories.

Verification

• python3 -m pytest desloppify/languages/python/tests/test_py_extractors.py -q # 39 passed
• python3 -m pytest desloppify/languages/python/tests -q # 289 passed
• python3 -m pytest desloppify/languages/python/tests/test_py_commands.py desloppify/tests/commands/test_cmd_detect.py desloppify/tests/commands/test_commands_base.py -q # 41 passed
• python3 -m ruff check desloppify/languages/python/extractors.py desloppify/languages/python/tests/test_py_extractors.py
• python3 -m ruff format --check desloppify/languages/python/extractors.py desloppify/languages/python/tests/test_py_extractors.py