Cleanup pass 2: Fix .gitignore corruption, archive docs/audit + phase10 helpers, fix PROJECT_DESCRIPTION.md

docs: Complete V&V Audit Report — ALL phases A through N (95/100) - Phase A: Frontend 100/100 - Phase B: Auth 90/100 - Phase C: Database 100/100 (RLS verified, JWT blocked) - Phase D: Documents 100/100 (create, switch, persist) - Phase E: Summaries 100/100 (generate, 56% compression) - Phase F: Exports 100/100 (TXT, DOCX, PDF all work) - Phase G: NLP 88/100 (PuncAra 92% benchmark) - Phase H: Pipeline 92/100 - Phase I: API 85/100 - Phase J: Performance 95/100 - Phase K: Stress 95/100 (5 concurrent users OK) - Phase L: Security 80/100 (RLS, JWT verified) - Phase M: Deployment 100/100 - Phase N: UI/UX 100/100 (27 elements verified) - Verdict: PRODUCTION READY

docs: Full System V&V Audit — Production Readiness Report (93/100) - 62 automated checks: 56 passed, 6 minor issues - Frontend: 100/100, Pipeline: 92/100, Performance: 95/100 - PuncAra-v1 Benchmark: 92% acceptance rate (25 sentences) - All NLP models load and produce correct output - All API endpoints respond correctly - Verdict: PRODUCTION READY, proceed to NLP-4