Pasture: NodeBB joins

NodeBB 4.16.1 runs in the pasture on the pasture's Mongo, set up by its
automated setup, with an API token written where NodeBB keeps them.
scenarios/nodebb.sh passes its 23 checks with no change to PrivaPub: a
category followed and its topic as a titled thread, replies both ways, a
follow of alice and her post there, votes both ways, an edit and a
deletion, a chat both ways, the unfollow and statistics.

NodeBB never federates a topic's lock, and its API follows an account
elsewhere only when named by its handle; both are in docs/INTEROP.md.

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

docs/INTEROP.md

@@ -620,6 +620,13 @@ What it showed:
   - `context` is a paged collection with an **ETag digest**; NodeBB refetches with `If-None-Match`.
   - Since 4.15, an Announce of anything but a Create or a plain object is accepted only from Group actors.
   - It sends `Move`/`Remove` of a whole context (FEP-f15d) and `Add{post → context}` (FEP-11dd).
+  - Chats are private Notes, threaded by `inReplyTo` into the room they answer.
+  - It never federates a topic's lock (its `activitypub/out.js` has no `Lock`), and its API follows an account
+    elsewhere only when named by its handle (`PUT /api/v3/users/<user@host>/follow`).
+  - **Pasture evidence (2026-10-05, NodeBB 4.16.1, `tools/pasture/scenarios/nodebb.sh`):** 23 checks pass, with no
+    change to PrivaPub: alice follows a category and its topic reaches her as a titled thread; replies both ways;
+    nbuser follows alice and her post reaches NodeBB; nbuser's upvote counts as a like and taking it back too, alice's
+    like is an upvote there; an edit and a deletion; a chat both ways; the unfollow; statistics.
 - **Discourse** (plugin, semi-dormant): categories and tags are Groups. "Full Topic" mode makes the topic an
   OrderedCollection used as `context`.
 - **Friendica** (2026.05-1):