Proposal + design + specs + tasks for the social layer. Adds a
`follows` relation (local + federated via ActivityPub), Follow buttons
on public profiles, and a `/feed` route showing public activities from
followed users.
Capabilities:
- New: social-follows (the graph + /feed)
- Modified: public-profiles (Follow button + counts)
- Modified: journal-landing (Feed link on signed-in dashboard)
Design picks:
- Pull-based feed (no fan-out-on-write) — fine at trails.cool scale
- follows keyed by actor IRI, local denorm FK for join perf
- Fedify wires Follow/Accept/Undo; we handle the DB side
- Remote activity ingestion via polling (not push) — tolerates our
downtime without losing activities
Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>
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