Judge each scholarship's program status at its own training

[maebeale]

🤖 suggested review level: 3 Read 📖 one column's rule swapped to the canonical service; no shared semantics touched

Split out of #2336 so it can ship on its own — it fixes a live bug and doesn't depend on that PR's active? / .active change.

Why

• The New / Ongoing / Reinstated column judged every award against today (Organization#program_status → Affiliation#active?).
• So a 2018 award showed the program's status now: an org that has since lapsed read Reinstate on a row where it was plainly Ongoing at that training — and the value moved silently as affiliations changed underneath it.
• It was also the last surface computing this word ad hoc, so it could disagree with the event reports and org profile chips about the same program on the same day.

What

• Each row anchors on the start date of the training it paid for, via Scholarship#event (allocation → event registration).
• Routes through FacilitatorProgramStatus, which ADR-0001 D4 already names as the one rule.
• Hover text names the anchor date and the reasoning, worded like the org profile's per-event chips.
• No registration behind the award (grant-first, or funding a CE registration) → year anchor, labelled "no event in view".
• Organization#program_status(recipient) deleted; it had no other caller.

Notes for reviewers

• Two rows on one page can now read differently. That's the point, but it's the visible behaviour change.
• Scholarship#event resolves through the preloaded recipient.event_registrations, not allocation.allocatable — a polymorphic preload can't reach the event, so walking the allocatable cost a query per row. recipient_must_match_allocation_registrant guarantees the funded registration belongs to the recipient. Verified: 0 per-row queries on the index scope.
• The strict-< anchor (ADR-0001 D8) means a first-time org still reads New at its own training — the affiliation that training minted starts on the anchor, so it doesn't count as prior history.

Tests

• Scholarship#event with and without an allocation.
• Ongoing / New / Reinstated at a given training; two awards judged at their own trainings; the year-anchor fallback; the explanation text.