CONTRIBUTING.md mandates pathlib.Path over os.path (added for
cross-platform/Linux support); the rest of the codebase's newer code
already follows it. Converts the 19 new _handle_export_* handlers to
pathlib (exists/mkdir/iterdir/is_file, expanduser().resolve()) so this
feature's new code is compliant. Tests updated to patch pathlib.Path.
Scope is limited to the new export-handler block; the pre-existing
os.path usage elsewhere in kicad_interface.py/export.py is untouched
here and will be migrated in a dedicated refactor PR to keep that
sweep reviewable in isolation.
Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
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