Restore point before Stufe 3 (central resolver-service refactoring). Includes this session's work: - Success Story (usecase) rebuild: new fields/tabs, UsecaseSerializer, thin List/Show renderers, MM relations, inline content elements. - vitec_columns content block (two-column layout with per-item content) incl. unified header section; special-cased JSON resolution. - Container per-column flex (items[].config align/justify) + gap on parent. - Unified header section across CEs/plugins/containers; header fields in JSON. - ISO-style architecture spec: Documentation/Headless-JSON-Architecture.md. - Cleanup: removed local scratch + verified .bak backups. - Fixes: B-6 (undefined thumbnail variable in Downloadcardcollection image resolver), B-7 (unsatisfiable legacy CType OR branch in Downloadcard/Datasheets). Rollback: git reset --hard snapshot-2026-07-09-pre-stufe3 Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>
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