k-ap now emits OutboundFollowAccepted when remote accepts our follow.
Bridge maps it to FollowAccepted domain event. Worker handler looks up
the actor's outbox URL and calls import_remote_outbox. Previously the
accept was silent — no backfill happened, feed stayed empty.
SocialIdentity value object (Local|Remote), SocialCommand/SocialQuery
domain ports, 11 CQRS use cases w/ 14 tests, CompositeSocialAdapter
wrapping k_ap, 6 new domain events, handlers migrated from ap_service
to use cases. Closes#12 foundation — AP handlers + legacy cleanup TBD.
- BackfillRequested now maps to BackfillFollower domain event (not FollowAccepted);
worker calls run_backfill_for_follower to send LOCAL content to new follower inbox,
instead of incorrectly trying to import from an inbox URL as if it were an outbox
- reviews broadcast as Create activity instead of Add (semantically correct)
- also_known_as JSON parse failure logs warning + preserves raw string as single-element
vec instead of silently returning empty
