feat: add DE proxy datasets DS-00015–17 + metrics updates — flatten dirs to .md
- Add DE-Platform-Media (DS-00015), DE-Epistemic-Competence (DS-00016), DE-Social-Mobility (DS-00017) with source stubs
- Update DE-Democracy-Metrics, DE-Federal-Budget, DE-Lobby-Transparency, DE-Parliament-Activity, Knowledge-Worker salaries
- Add get-de-digital script for digital economy data retrieval
- Update de-plan1-sven with revised strategy sections
- Rename flat-dir index files to .md (Arguments, Claims, Problems, Values)
- Append new entries to Data/UPDATES.md
Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>
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