Replace exact-string assertions in test_correctable_ocr_error_gets_corrected
and test_sentence_with_multiple_corrections with structural assertions that
verify behavior (correction attempted, marker present, expected stem) without
coupling to a specific pyspellchecker version's frequency weights.
Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>
Strict greater-than avoids non-determinism: if multiple candidates share
the minimum frequency value, pyspellchecker's ranking is undefined.
Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>
Drop underscore prefix — the helper is part of confidence.py's effective
public API since spell_check.py imports and calls it directly.
Fixes reviewer concern: importing a _-prefixed name across module boundaries
contradicts Python's private-by-convention signal.
Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>
153K words from dtak+dtae 1800-1899 corpora (min_freq=20),
covering pre-reform spellings common in Kurrent/Süterlin documents.
Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>
