Build the person + per-record activity timeline (maybe on PaperTrail?)

🤖 From Claude:

Background

PR #2245 makes PaperTrail the source of record-change activity and adds an indexed versions.subject_person_id populated across the registration cluster, money/membership models, and the person cluster (Person/Affiliation/Address/ContactMethod/Asset; Organization/Discount tracked but unscoped). It does not build the timeline itself — that's this issue.

Goal

Build the real activity timeline as a chronological interleave of three sources, each doing what it's best at:

• PaperTrail — record changes (create/update/destroy, incl. deleted records)
• Notifications — communications, read directly (not versioned)
• Ahoy — visits + page/views (PaperTrail can't produce these)

Scope

1. Person timeline — single indexed sweep PaperTrail::Version.where(subject_person_id: person.id).order(:created_at), merged with the person's Notifications and Ahoy visit/view events. Extend Analytics::PersonTimeline (already interleaves sources).
2. Per-record timeline — a record's own versions plus its children's (query by item_type/item_id for the record + its dependent children). E.g. a registration timeline = the registration + its attendance entries, checklist completions, org links, CE regs, allocations, comments.
3. Deleted-record viewer — versions persist after deletion but nothing surfaces them today (the Change Log partial reads a live record.versions). Add a view that queries the versions table directly.
4. Presenter — render each version as a human line (event + changed fields + whodunnit); derive semantic labels where useful (see #2249 for User auth labels).

Then (separate cleanup, after this lands)

• Retire the redundant Ahoy lifecycle/mutation tracking (AhoyTrackable) once PaperTrail fully covers it. Keep Ahoy's visit/view tracking — that's the piece only Ahoy does.

Related

• Foundation: #2245
• User semantic auth events: #2249

Start with Analytics::PersonTimeline and the existing Change Log partial, then review foundation PR #2245 and semantic auth events in #2249. The work is done when person and per-record timelines interleave PaperTrail, Notifications, and Ahoy events, deleted records are viewable from versions, and each version has a human-readable presenter.