Pasture: Vernissage 1.43.0

Vernissage joins the pasture on SQLite with its queues on the shared Redis; scenarios/vernissage.sh: follows both ways,
a photo with its alt text, likes, boosts and comments both ways, a deletion, the unfollow and statistics: 19 checks,
with no change to PrivaPub.

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

CLAUDE.md

@@ -561,6 +561,9 @@ tools/pasture/run.sh down                                            # removes e
   checks.
 - **Pins (`scenarios/pins.sh`, needs mastodon):** a Mastodon account pins and unpins while alice follows it, alice pins
   and unpins while it follows her, and a fresh account's earlier pin shows once PrivaPub resolves it. 8 checks.
+- **Vernissage (1.43.0):** its image on SQLite in the `pasture-vernissage` volume, its queues on the shared Redis's
+  database 0 (it federates nothing without them; every other database is taken), its seeded admin (admin / admin)
+  logged in by the scenario. `scenarios/vernissage.sh`, 19 checks.
 - **BookWyrm (0.9.3):** its image, migrated, on the shared Postgres (database `bookwyrm`) and Redis (databases 14
   and 15), gunicorn and one Celery worker (federation runs there). It has no client API: bwuser (named
   `bwuser@bookwyrm.test`, as its signup names users), a book and every status come from its Django shell