fix: Restore all files lost during destructive rebase

A previous `git pull --rebase origin main` dropped 177 local commits,
losing 3400+ files across admin-v2, backend, studio-v2, website,
klausur-service, and many other services. The partial restore attempt
(660295e2) only recovered some files.

This commit restores all missing files from pre-rebase ref 98933f5e
while preserving post-rebase additions (night-scheduler, night-mode UI,
NightModeWidget dashboard integration).

Restored features include:
- AI Module Sidebar (FAB), OCR Labeling, OCR Compare
- GPU Dashboard, RAG Pipeline, Magic Help
- Klausur-Korrektur (8 files), Abitur-Archiv (5+ files)
- Companion, Zeugnisse-Crawler, Screen Flow
- Full backend, studio-v2, website, klausur-service
- All compliance SDKs, agent-core, voice-service
- CI/CD configs, documentation, scripts

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

agent-core/requirements.txt

@@ -0,0 +1,19 @@
+# Agent Core Dependencies
+# Note: Most dependencies are already available via voice-service/backend
+
+# Async support (should be in voice-service already)
+# asyncio is part of Python standard library
+
+# Redis/Valkey client (already in project via voice-service)
+# redis>=4.5.0
+
+# PostgreSQL async client (already in project)
+# asyncpg>=0.28.0
+
+# Testing dependencies
+pytest>=7.4.0
+pytest-asyncio>=0.21.0
+pytest-cov>=4.1.0
+
+# Type checking (optional)
+# mypy>=1.5.0