Town: Iceshrimp.NET joins, and its mentions go nowhere new

Iceshrimp.NET 2026.1.2-beta runs in the pasture with AuthorizedFetch on;
its driver registers through the native API and takes Mastodon tokens from
its OAuth form. The pair passes 225 cells. A new Iceshrimp note reaches its
author's followers only, never an account it mentions or answers, until it
is edited (G-0004, peer): delivery cells now say when a server holds a post
only because it was addressed.

The checker credits a seeder's fetch to the object fetched, not to the reply
that needed it; the seeder skips the wait for an accept whose follow was
already accepted; the PrivaPub driver signs its roots in again when a run
reuses saved sessions.

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

tools/pasture/town/dialects/__init__.py

@@ -2,6 +2,7 @@
 from dialects.akkoma import Akkoma
 from dialects.gts import Gts
 from dialects.hollo import Hollo
+from dialects.iceshrimp import Iceshrimp
 from dialects.lemmy_api import LemmyApi
 from dialects.mastodon import Mastodon
 from dialects.misskey_api import Misskey, Sharkey
@@ -16,6 +17,7 @@ DRIVERS = {
 	"akkoma": (Akkoma, "akkoma.test"),
 	"lemmy": (LemmyApi, "lemmy.test"),
 	"hollo": (Hollo, "hollo.test"),
+	"iceshrimp": (Iceshrimp, "iceshrimp.test"),
 }
 
 _made = {}