Every bare `except Exception: pass` or `except Exception: return sentinel`
now logs via logger.exception() or logger.warning() so errors surface in
the application log instead of disappearing silently.
Changes per file:
- admin/routes.py: add logger; log in _inject_admin_sidebar_data(),
email_detail() Resend enrichment, audiences() contact count loop,
audience_contacts() Resend fetch
- core.py: log in _get_or_create_resend_audience(), capture_waitlist_email()
DB insert, and capture_waitlist_email() Resend contact sync (warning level
since that path is documented as non-critical)
- analytics.py: log DuckDB query failures before returning []
Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>
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