R8 the Mastodon API made real: featured tags, endorsements, notes, notify and languages, suggestions, the direct stream

Featured tags per persona (/api/v1/featured_tags, suggestions, tags/:name/feature, accounts' featured tags, max 10),
listed at /tattoos as Hashtags and sent as Add/Remove{Hashtag} to followers on the featured collection, as Mastodon
sends them; remote accounts' tags received and read from featuredTags. Endorsements (pin/endorse) and private notes
(PersonaNote) kept per persona and never federated; the relationship's notifying, languages, endorsed and note, with
follow's notify (status notifications) and languages (home filter). Reading preferences set on /clientapi. Suggestions
v1/v2 with dismissals and staff picks, never the persona or a sibling. conversation events on the direct stream.
translate, annual reports and the admin API answer. New collections backed up and removed with their persona.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01WpVCoDeM1qUTRp4fXQdfof

FEDERATION.md

@@ -132,6 +132,7 @@ actor document, a collection, NodeInfo or a delivery relates two avatars of the
 | Direct-message context | `/peasants/{name}/whispers/{id}` |
 | A persona's wall (FEP-400e) | `/peasants/{name}/graffiti` |
 | Followers on the asking server (FEP-8fcf) | `/peasants/{name}/groupies/roll-call` |
+| Featured (pinned) posts, featured hashtags | `/peasants/{name}/trophies`, `/peasants/{name}/tattoos` |
 | A custom emoji of this server (`Emoji`) | `/emojis/{shortcode}` |
 | Profile and post pages | `/@{name}`, `/@{name}/{id}` |
 
@@ -216,12 +217,13 @@ Received:
 | `Delete` | deletes the object, or the actor and its follows; a deleted object id is remembered for 90 days, so a late `Create` cannot bring it back, though a new post its server publishes under that id after the deletion (Gancio numbers events from the last one kept) is kept |
 | `Flag` | becomes a report for this server's moderators |
 | `Move` | an account moving: believed as Mastodon believes it, when the account sends it about itself and the new account, read again from its server, names it in `alsoKnownAs`. The old account then shows where it went (`moved`), and, as Mastodon does it (owner decision 2026-10-05), the personas following it follow the new one instead (a Follow to its server, an Undo to the old), in the same lists; a mute or a block of the old account carries over |
+| `Add`/`Remove` of a `Hashtag` on the actor's `featured` or `featuredTags` | the account features a hashtag on its profile, or stops (Mastodon sends them to `featured`); shown as its featured tags (`GET /api/v1/accounts/:id/featured_tags`). Its `featuredTags` collection itself is read with its counts, at most once a day (20 tags at most) |
 | `Add`/`Remove` on the actor's `featured` | the account pins or unpins one of its own posts (fetched from its server when not held); inside a community's announce, the community features a post made in it. Its profile shows them first (`pinned=true`). The collection itself is read with the account's counts, at most once a day. On the account's wall (`sm:wall`), see "Walls". Any other target (a community's moderators) is dropped; one on the account's own server that PrivaPub does not know has its document read again first, at most hourly |
 | `Block` of a persona | the follows between them end, the blocker's posts and notifications are hidden from the persona, nothing of the persona's is addressed to the blocker, and the relationship says `blocked_by`; `Undo{Block}` lifts it |
 
 Sent: `Follow`, `Undo{Follow}`, `Create{Note}`, `Create{Question}` and poll votes, `EmojiReact` and its `Undo`, `Update{Note}`, `Update{Person}`, `Delete{Tombstone}`, `Accept{Follow}`,
-`Reject{Follow}`, `Like`, `Dislike`, `Announce` and their `Undo`, `Flag`, `Join` and `Leave` of a remote event, and the
-replies to a persona's posts passed on to its followers. A deleted post answers 410 with a `Tombstone`.
+`Reject{Follow}`, `Like`, `Dislike`, `Announce` and their `Undo`, `Flag`, `Join` and `Leave` of a remote event,
+`Add`/`Remove` of a pinned post or a featured `Hashtag`, and the replies to a persona's posts passed on to its followers. A deleted post answers 410 with a `Tombstone`.
 
 - **Votes.** A favourite is a `Like`, a downvote a `Dislike`; a persona has one vote a post, and a changed vote is sent
   as the new vote alone, as Lemmy sends one (an `Undo` of the old one beside it could arrive after it and take the new
@@ -256,8 +258,21 @@ replies to a persona's posts passed on to its followers. A deleted post answers
   post on its wall. The wall lists the persona's public posts that start a thread and what was written on it, newest
   first. An account elsewhere that tells its followers here, with `Add{Note}` on its own wall, of a post written there
   has it shown to them as on its wall (`privapub.wall` on the status); a `Remove` there takes it away.
-- **Pinned posts** are the actor's `featured` collection (`/trophies`); `featuredTags` is `/tattoos`. A pin or an unpin
-  is told to the post's audience as `Add` or `Remove` on `featured`, as Mastodon tells it.
+- **Pinned posts** are the actor's `featured` collection (`/trophies`). A pin or an unpin is told to the post's audience
+  as `Add` or `Remove` on `featured`, as Mastodon tells it.
+- **Featured hashtags** are the actor's `featuredTags` collection (`/tattoos`): an `OrderedCollection` of `Hashtag`s, in
+  the order the persona featured them (ten at most), each `{"type": "Hashtag", "href": "<this server>/tags/<tag>", "name":
+  "#Tag"}`. Featuring one sends its followers
+  ```json
+  {"id": "…/peasants/alice/grunts/feature-tag-…", "type": "Add", "actor": "…/peasants/alice",
+   "object": {"type": "Hashtag", "href": "https://privapub.thepra.dev/tags/gardening", "name": "#Gardening"},
+   "target": "…/peasants/alice/trophies", "to": ["…#Public"], "cc": ["…/peasants/alice/groupies"]}
+  ```
+  and unfeaturing it the same `Remove`. The target is the `featured` collection, not `featuredTags`: that is what Mastodon
+  sends and the only target it takes a Hashtag from (it tells a pin from a tag by the object's type).
+- **What is never sent:** a persona's endorsements of other accounts (Mastodon's account pins and 4.4's endorsements) stay
+  private, never published as featured accounts or a collection; its private notes on accounts and its dismissed follow
+  suggestions are its own. No collection lists who follows whom (familiar followers are never shown either).
 - **Blocks are sent.** A blocked remote account receives `Block` from the blocking account (and `Reject{Follow}` if it
   followed); an unblock sends `Undo{Block}`. A server's block of a whole server sends that server nothing; the
   administrator may list it at `/api/v1/instance/domain_blocks` (off for each block by default, its name partly hidden