Pasture: Owncast 0.3.0

Owncast joins the pasture with federation turned on through its admin API; scenarios/owncast.sh has alice follow the
stream, receive its admin's message, like and boost it (both show in Owncast's admin), and unfollow: 13 checks, with
no change to PrivaPub.

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

docs/INTEROP.md

@@ -753,6 +753,15 @@ PeerTube's own instance account announces each new video too, which we drop: nob
 follow only PeerTube-like channels and accounts, never a persona. It checks the `Host` header against its own name,
 without a port, before it gives out its OAuth client.
 
+### Owncast 0.3.0
+
+- The instance is one `Service` actor (`/federation/user/<name>`): it is followed, never follows, posts when it goes
+  live and what its admin sends, and lists the likes, boosts and follows it receives as "fediverse engagement".
+  Federation is off until the admin turns it on with the server's address.
+- **Pasture evidence (2026-10-05, `tools/pasture/scenarios/owncast.sh`):** 13 checks pass, with no change to PrivaPub:
+  alice follows the stream and is listed, the admin's message reaches her home, her like and boost show in its admin,
+  the unfollow, statistics.
+
 ### WriteFreely 0.17.2
 
 - Each blog is an actor (`/api/collections/<alias>`) whose posts go out as `Article`s with their title and the whole