docs: requirements v5 – quality review fixes (3 critical, 8 major, 8 minor/suggestion)
Critical:
- F-CAD-13: Autosave/Crash Recovery (60s, restore on restart)
- F-CAD-04: Expanded snap system (Center, Perpendicular, Tangent, Nearest, Quadrant)
- F-CAD-13a: Units Management (mm, cm, m, inches, feet) + Q-12 resolved
Major:
- F-CAD-07: Lasso/Polygon selection
- F-UI-04/04a: Extended shortcuts + customization
- NF-PLAT-01: Browser compat (last 2 major versions, Playwright)
- F-MU-06/06a: Offline/PWA + conflict visualization
- NF-PLAT-04: PWA installable
- F-MU-07: Versionshistorie (50 versions, diff, non-destructive)
- NF-A11Y-01: WCAG 2.1 AA + Q-10 resolved
- F-MU-05/05a: RBAC granularity + permission matrix
- F-CAD-09: Undo/Redo quantified (100 steps)
Minor/Suggestion:
- Non-Goal #11: Bestuhlungs-Zaehlung is not a non-goal
- F-CAD-14: Search/Find
- F-LAY-07: Layer-State import/export
- F-LIB-08: Bibliotheks-Paket-Import (ZIP)
- NF-SEC-06: GDPR compliance
- NF-SEC-07: API rate limiting
- F-UI-11: i18n readiness
- 3 new risks: data loss, large import, cross-browser rendering
- F-CAD-03/F-BG-02: Units generalized
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