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/specs/iceshrimp-pair.json

@@ -0,0 +1,22 @@
+{
+	"schema": "pasture-town/1",
+	"name": "iceshrimp-pair",
+	"seed": 20261006,
+	"peers": {
+		"privapub": {"roots": 1, "personas": [2, 2], "circles": 1, "communities": 0},
+		"iceshrimp": {"accounts": 3}
+	},
+	"profiles": {"locked": 0.2, "bot": 0.0, "fields": [0, 2], "avatar": 0.9, "header": 0.3, "bioWords": [5, 12],
+		"langs": {"en": 80, "it": 20}},
+	"graph": {"follows": [2, 4], "mutual": 0.6, "pending": 0.0, "rejected": 0.0},
+	"circleMembers": 2,
+	"content": {
+		"posts": 24,
+		"mix": {"text": 40, "cw": 10, "tags": 10, "mention": 10, "image": 10, "poll": 10, "quote": 10},
+		"visibility": {"public": 50, "unlisted": 10, "followers": 20, "direct": 10, "circle": 10},
+		"replyRounds": 2, "replies": 0.5, "deeperReplies": 0.4
+	},
+	"interactions": {"likes": [0, 3], "boosts": [0, 1], "react": 0.4, "vote": 0.8, "bookmark": 0.1},
+	"mutations": {"edit": 0.15, "delete": 0.05, "blocks": 0, "mutes": 1, "reports": 0},
+	"time": {"roundSettleSeconds": 15, "graphSettleSeconds": 20, "settleSeconds": 30, "deadlineSeconds": 120}
+}