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Two generic noise filters added to _ocr_single_cell(): 1. Word confidence filter (conf < 30): removes low-confidence words before text assembly. Catches trailing artifacts like "Es)" after real text, and standalone noise from image edges. 2. Cell noise filter: clears cells whose entire text has no real alphabetic word (>= 2 letters). Catches fragments like "E:", "3", "u", "D", "2.77", "and )" from image areas, while keeping real short words like "Ei", "go", "an". Both filters apply to word-lookup AND cell-OCR fallback results. Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>