Marcel cff486dda7 fix(normalizer): treat leading date qualifiers (nach/vor/…) as APPROX ...

_preprocess now sets approx=True when a leading marker is stripped; add
_match_year_only so bare years (e.g. "nach 1900" -> "1900") resolve to
1900-01-01/YEAR before being upgraded to APPROX. Strengthen
test_parse_approx_marker_upgrades_precision and add
test_parse_leading_qualifier_is_approx (11 tests, all pass).

Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>

2026-05-25 13:35:19 +02:00

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