docs: NLP-3.5 Hardening Sprint — Complete audit reports (6 docs) - hardening-final-report.md: Full sprint summary (9/9 tasks done) - analyze-stress-test.md: 50-2000 chars, all pass - nlp-performance-breakdown.md: AraSpell ~700ms/word bottleneck - suggestion-priority-audit.md: grammar(3)>punc(2)>spell(1)>auto(0) - overlap-resolution-report.md: 4/4 overlap tests clean - text-processing-strategy.md: Skip AraSpell for >300 chars 500 chars: TIMEOUT→28s | Overlaps: 1→0 | API: backward compatible
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