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Fix #18: include BOS/EOS markers in blanktag FST lookup The whitespace analyser lookup string was built from Escaped (superblank) blocks only, dropping the __DIVVUN_BOS__/__DIVVUN_EOS__ Text markers. The errorwhitespace FST recognises these markers, so without them a sentence-initial token looked identical to one with a genuinely missing space: a leading "(" ("(2) ...") was wrongly flagged no-space-before-parent-start, where libdivvun reports nothing. Match libdivvun's blanktag and include the BOS/EOS markers in the lookup (they are still stripped from the output stream). The leading "(" now gets <firstCohort> and no error; real mid-sentence cases ("boazu(2)" -> "boazu (") still flag, and the end-of-input cohort now correctly gets <LastCohort> (as libdivvun does) rather than <LastCohortOfParagraph>.