ErrorHandler::userMessage only handled RuntimeException, but all validation
throws in ThesisCreateController and ThesisEditController use plain Exception.
This caused user-friendly messages like 'Le champ Nom/Prénom/Pseudo est requis'
to fall through to the 'Une erreur inattendue est survenue…' generic message.
Fix: add Exception check (after PDOException, since PDOException extends it)
so all validation exceptions pass their message through.
- ErrorHandler tests: 77 assertions covering FK extraction, normalization, dedup, edge cases. Fix FK table map for child tables.
- Fix FK violation: (int)null → 0 in createThesis for orientation/ap/finality/license FK columns. Add FK value logging to updateThesis.
- Add CURRENT_ISSUES.md with summary of FK violation, dev debugging, and tag dedup status for next conversation