Rename organization_status → program_status, then rip out the stored field for computed program status

[maebeale]

🤖 From Claude: Captured from a working session on #1993 (org index/profile program-status rework). Two follow-ups, in order.

Phase 1 — rename organization_status → program_status in code (no behavior change)

The org's status concept is really its program status. Rename for clarity while keeping the stored field:

• Model: belongs_to :organization_status, organization_status_id column, OrganizationStatus model + OrganizationStatusDecorator, the /organization_statuses admin CRUD, PROGRAM_STATUS_BUCKETS.
• Decorator: organization_status_bucket / organization_status_label / organization_status_classes / organization_status_chip.
• Scope/params/filter: Organization.program_status scope (already named), program_status filter param, organization_status_id in strong params, @organization_statuses.
• Note: EventRegistration's look-alike was already renamed to organization_linking_status — leave it.
• Mostly mechanical; do it as its own PR so the diff is reviewable.

Phase 2 — rip out the stored field; program status becomes fully computed

Program status is already computed from facilitator affiliations and only falls back to the stored status in two places (both already isolated for exactly this):

1. OrganizationDecorator#organization_status_bucket — delete the "else → stored bucket" fallback branch.
2. Organization.program_status scope — delete the "OR stored-status" half.

Then remove the field's ecosystem:

• Migration: drop organizations.organization_status_id (+ FK) and the organization_statuses table.
• Delete OrganizationStatus + OrganizationStatusDecorator; remove belongs_to + validates :organization_status_id, presence.
• Delete the /organization_statuses admin CRUD (controller, 5 views, policy, routes) and the "Organization statuses" card in admin_cards_helper.
• Delete the affiliation sync callbacks (sync_organization_status_with_affiliations, deactivate_organization_if_no_active_people, reactivate_organization_if_inactive) — keep sync_organization_affiliation_dates (dates, not status).
• Remove status from seeds (db/seeds.rb, db/seeds/dev/organizations.rb, db/seeds/dev/events_management.rb), the org factory association :organization_status, and the organization_status factory.
• Edit form: remove the status select + facilitator_status_name/status_matches_affiliations/show_status_select + hidden field.
• event_registrations_controller Organization.create!(…, organization_status: …) — drop the arg.
• organizations_results.html.erb status_label (shows the stored name on unpublished orgs) — rework/remove.
• Specs / AGENTS.md — drop everything referencing OrganizationStatus.

Decision made this session

Organization.active / published? (org public visibility) currently means "status Active OR any active affiliation." When the field is removed, it should mean an active facilitator affiliation (i.e., program-status Active). This is the load-bearing/risky change — it changes which orgs are publicly visible.

Before dropping

Export/backfill the manual Pending / Suspended values first if anyone wants that history — the column drop discards them.