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When no IPA signals exist (e.g. German-only dicts), the fallback that guesses en_col_type was incorrectly triggered for en/de modes, causing false IPA and syllable insertions. Now only fires for 'all' mode. Syllable en mode also returns empty set when no EN column found. Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>