[maebeale]

🤖 suggested review level: 4 Check ✅ availability predicates gain an issued override, roster cell + readiness read availability, CE reads preloaded

This PR makes both the certs work the same.

The roster's certificate sliders read like "available," but they only stored "sent." So someone who attended (and finished scholarship tasks) showed grey even though they could already download their certificate, sliding the event certificate on never unlocked it, and readiness kept them at "Certificate not sent" until an admin flipped it by hand. Admins were also unsure what the unlock conditions were.

• Both certificates still unlock automatically — no callback or stored flag
  • Event: training ended + attended + scholarship tasks done
  • CE: ended + attended + CE approved and paid + CE form (if any) + signed-in time (if tracked)
• Marking issued now unlocks (the admin "make it available now")
  • Event certificate: certificate_sent_at now counts in EventRegistration#certificate_available? (before it only fed readiness)
  • CE certificate: certificate_sent_at now counts in ContinuingEducationRegistration#certificate_available? (before, an issued CE cert could still be locked)
• Roster cell
  • Unlocked on its own → green "Available", no slider
  • Otherwise → slider; once on, stays a slider so it can be switched off
  • Tooltips spell out the exact unlock requirements (CERTIFICATE_REQUIREMENTS on each model)
  • CE toggle also refreshes the event certificate cell (issued CE unlocks it)
  • Column headers unchanged
• CE edit page: switch relabeled "CE certificate availability", same requirements tooltip
• Readiness: "Certificate not sent" → "Certificate not available" (event + CE)
  • Completed once the certificate(s) unlock — no manual send needed
  • Denied CE is skipped by every CE readiness check (unpaid, license, certificate); the badge notes "CE denied" instead
• No per-row queries for CE availability
  • Event#ce_callout memoized (like scholarship_callout)
  • Roster preloads attendance entries + form completions for CE rows only
  • Query-count spec: adding CE registrants adds no roster queries
• ⚠️ An issued CE cert now unlocks even if that CE was denied — issuing is the admin's explicit call

🤖 Generated with Claude Code