feat(detect): Detect cross-hatched (X-pattern) redactions#209
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Some documents use repeating X patterns drawn over dark rectangles to redact text. The pixmap filter can't catch these because the cross-hatching creates two colors (e.g., black + dark gray). Instead of pixel analysis, detect X-hatch drawings directly from their PDF structure: pairs of diagonal lines sharing the same x-range, tiled across the redacted area. Text underneath is extracted and passed through the standard text filters. Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>
Replaces the old test_cross_hatches_are_ok (which only checked char count at the intersection stage) with test_cross_hatched_redactions that verifies the full pipeline detects 16 bad redactions. Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>
Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>
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Fixes: #169
Summary
test_cross_hatches_are_ok→test_cross_hatched_redactionsto assert 16 bad redactions detected (was only checking char count)Test plan
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