One delivery a server; BookWyrm 0.9.3 in the pasture

An activity now goes once to each server, to its shared inbox when it has one, for the accounts a post names, answers
or quotes as for its followers, as Mastodon delivers (a circle post excepted: each member's copy names that member).
BookWyrm took the same post twice when one copy reached its shared inbox and another the named account's inbox at once.
SharedInboxTests checks a reply to a follower's post goes once.

BookWyrm joins the pasture (peers/bookwyrm.sh: its image on the shared Postgres and Redis, gunicorn and a Celery worker,
its user, book and statuses made in its Django shell). scenarios/bookwyrm.sh: follows both ways, a review, a comment and
a quotation reaching alice as BookWyrm's pure posts, her like, boost and reply landing there, her post naming bwuser and
bwuser's like and reply, a deletion, the unfollow and statistics: 20 checks. GoToSocial (64), Mastodon (57) and Misskey
(35) still pass.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01LsXgEaXee4GCU1hwYgPJXw

FEDERATION.md

@@ -38,6 +38,7 @@ and every run starting clean, with signed fetches required (as privapub.thepra.d
 - **WriteFreely 0.17.2**
 - **Owncast 0.3.0**
 - **Ghost 6.67** with its ActivityPub service 1.2.14
+- **BookWyrm 0.9.3**
 - **Activity-Relay 2.0.9** and **aode-relay 0.3.129**, as relays PrivaPub reads from
 - in the town only (a seeded community checked server by server): **Hollo 0.9.19**, **Iceshrimp.NET 2026.1.2-beta**,
   **Pleroma 2.10.2**
@@ -330,7 +331,9 @@ Posts with a location (shown to nearby users of this server) never leave the ser
   votes. All of them are always sent with their object embedded. Every boost and every favourite is an activity of its
   own (`announce-{boost}`, `like-{favourite}`), so one given again after its `Undo` is new to the server it reaches.
 - **Hashtags.** A post's `Hashtag` links go to `/tags/{tag}`, a public page of this server's public posts with that tag.
-- **Delivery.** Failed deliveries are retried with Mastodon's backoff (16 attempts). A host that keeps failing is paused,
+- **Delivery.** An activity goes once to each server, to its shared inbox when the server has one, whoever there it
+  follows, names or answers (a circle post excepted: each member's copy names that member). Failed deliveries are
+  retried with Mastodon's backoff (16 attempts). A host that keeps failing is paused,
   starting at an hour and growing to a week. A server can also take a Follow (202) and drop it afterwards, as Pleroma
   does when it cannot yet fetch our actor, so a follow request still unanswered is sent again, same activity, when the
   persona follows once more, at most once an hour.