[FanWu-ai]

Summary

• Preserve method-level v_args settings when staticmethod or classmethod is the outer decorator.
• Honor the documented precedence over class-level settings instead of wrapping the callback again.
• Cover both descriptor types, both decorator orders, and ordinary, meta, and tree arguments (12 regression cases).

Validation

• Regression on original code: 6 cases fail; all pass with this change.
• Python 3.10.22 full suite: 1338 tests, OK (148 existing skips), including all 8 Nearley tests with unchanged Js2Py==0.68.
• Pristine Python 3.10 baseline: 1337 tests, OK (148 existing skips).
• Python 3.12 and 3.13 full suites: 1330 tests, OK (148 existing skips); Nearley is unavailable on these interpreters due to pinned Js2Py compatibility.
• mypy==1.12: all 34 source files pass.
• All configured pre-commit checks pass; git diff --check passes.

AI assistance was used to investigate, implement, and test this change.