send_follow now emits a Follow activity via emit_activity() instead of
inline HTTP POST. New ap_follow_handler delivers to the remote inbox;
EventProcessor retries on failure. Wildcard delivery handler skips
Follow type to avoid duplicate broadcast.
Also add /social/ index page to per-app social blueprint.
Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>
Lightweight social pages (search, follow/unfollow, followers, following,
actor timeline) auto-registered for AP-enabled apps via shared blueprint.
Federation keeps the full social hub. Followers scoped per app_domain;
post cards show "View on Hub" link instead of interaction buttons.
Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>
