ba0f659d1e
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= signs are used as definition markers in textbooks ("film = 1. Film").
They were incorrectly removed by two filters:
1. grid_build_core.py Step 5j-pre: _PURE_JUNK_RE matched "=" as
artifact noise. Now exempts =, (=, ;, :, - and similar meaningful
punctuation tokens.
2. cv_ocr_engines.py _is_noise_tail_token: "pure non-alpha" check
removed trailing = tokens. Now exempts meaningful punctuation.
Fixes: "film = 1. Film; 2. filmen" losing the = sign,
"(= I won and he lost.)" losing the (=.
Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>