[leeshengis]

Closes #234.

structure_attrs_fromtuple currently passes every field to the constructor positionally, so attrs classes and dataclasses with keyword-only fields raise TypeError.

Keep conversion in tuple field order, but pass keyword-only values by their constructor names. Use attrs aliases (including private-field aliases), with the field name as the fallback for dataclasses. Positional arguments, omitted defaults and attribute-converter precedence retain their existing behavior.

Regression coverage includes both converter classes, class-wide and mixed keyword-only fields, inheritance, aliases, defaults and type conversion. The existing tuple property test now also generates keyword-only fields. A changelog entry is included.

Validation against main at 57333a2:

• New regressions on the original code: 22 failed, 8 passed. With the fix, all 30 pass, along with the existing tuple property test.
• Full test suite with the locked dependencies and optional test extras: Python 3.10: 1044 passed, 7 skipped, 15 xfailed; 3.11: 1051 passed, 15 xfailed; 3.12 and 3.13: 1089 passed, 15 xfailed each; 3.14: 1116 passed, 15 xfailed, including Mypy/Pyrefly typing tests.
• The original issue's inheritance example round-trips through in-memory SQLite with both BaseConverter and Converter.
• Relevant tests also pass with attrs 26.1.0 (57 passed); the locked version is attrs 25.4.0.
• Repository Ruff lint and format checks, and git diff --check, pass.

Python 3.15, PyPy, performance benchmarks and upstream GitHub CI have not been run locally. This change does not address postponed annotations (#785) or init=False fields.

AI assistance was used for investigation, implementation and testing. I reviewed and approved this patch before submission and take responsibility for the contribution under the project's AI policy. There are no LLM co-author tags.