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

FEDERATION.md

@@ -36,6 +36,7 @@ and every run starting clean, with signed fetches required (as privapub.thepra.d
 - **Mitra 5.9.1**
 - **snac2 2.95**
 - **WriteFreely 0.17.2**
+- **Owncast 0.3.0**
 - **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**