Move vitality.py/vitality_routes.py from root diagnostics/ to ops/diagnostics/ (canonical location).
Overwrite ops/diagnostics/alerting.py and alerting_routes.py with root versions (newer: SQL injection protection via _ALLOWED_DIM_EXPRS, proper error handling + conn.close).
Remove root diagnostics/*.py — all code now in ops/diagnostics/.
Include diff log documenting resolution of each multi-copy file.
Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>
