Add ARCHITECTURE.md documenting data flow and active vs. legacy code

Built with a graphify code-graph pass to identify the real dependency
structure. Documents the ingestion -> training -> tip generation ->
notification flow, the EV/quality-score rationale, and several
non-obvious facts surfaced by this session's debugging: automation
runs on launchd not crontab (the crontab comments are stale), the
Lottoland/lottoAPI fallback exists but isn't wired into the update
job, and the repo-root generator scripts are legacy/unused - only
scripts/generators/ultimate_ai_ml_hybrid_generator.py is live.

graphify-out/ itself is gitignored as a regenerable build artifact.

Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>

.gitignore

@@ -60,3 +60,6 @@ data/*.backup*
 data/generated_tips/weekly_lotto_tips_*.csv
 data/performance_reports/
 data/data/
+
+# graphify Code-Graph (regenerierbar via /graphify --update)
+graphify-out/