[KennyMcSimpson]

find_config_file() and its equivalents promise to search in iter_*_paths() order, but they invoke the methods on PlatformDirsABC directly. Subclasses that customize those public iterators lose their search paths during file lookup, so an existing configuration returned by iter_config_paths() is reported missing.

Resolve each iterator from the concrete class while retaining the copy with ensure_exists=False. Add regressions for all six directory kinds, both lookup forms, ordering and read-only behavior; document the subclass behavior and include a changelog fragment.

Validation on Windows:

• New regressions fail on the original source: all 12 fail.
• Official Tox Python 3.12, 3.13 and 3.14: each 2053 passed, 350 skipped; changed-line coverage 100%.
• All 14 pre-commit hooks, strict type checks, prose and Sphinx with -W, sdist/wheel build, Twine, wheel contents, combined coverage and towncrier fragment checks pass.
• Python 3.11, 3.15, PyPy and free-threaded CPython were unavailable locally; Linux and macOS were not run locally. Tool/package environments used Python 3.12 because the configured 3.15 is unavailable.

The complete aggregate tox run was followed by a passing fix rerun after normalizing local YAML line endings. No workflow changes are included.

Prepared with AI assistance.

[Eee622]

Hell