Pasture: scenarios run again on the same pasture, and Mastodon's threads

GoToSocial's and Mastodon's scenarios passed once on a fresh pasture only:
their locked follows ended followed, so a second run found no request to
reject, and Mastodon's ended with mastouser blocking alice_masto, so every
follow after it was rejected. Each now unfollows first, and Mastodon's
undoes its block (checking that its Undo{Block} reaches our blocked_by) and
its lock; a run cut short is undone at the start.

Mastodon's scenario also checks the thread backfill live: a reply by an
account nobody here follows is never delivered, and joins the thread once
alice_masto opens it, read from Mastodon's FEP-7888 context.

interop.sh keeps the results of the peers it does not run, so the report
merges a partial rerun. All seven scenarios: 276 pass, 0 fail, 1 expected
(Lemmy moderation, P7).

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

tools/pasture/scenarios/gts.sh

@@ -176,6 +176,9 @@ echo "locked personas"
 LT=$(privapub_token locked_alice); LH="Authorization: Bearer $LT"
 curl -s -o /dev/null -X PATCH -H "$LH" "$P/api/v1/accounts/update_credentials" -d 'locked=true'
 locked_on_gts=$(gcurl -s -H "$GH" "$G/api/v2/search?q=@locked_alice@privapub.test&resolve=true&type=accounts" | j "print(d['accounts'][0]['id'])")
+# gtsuser follows locked_alice once a run has passed here: unfollow first, so the follow below is a new request
+gcurl -s -o /dev/null -X POST -H "$GH" $G/api/v1/accounts/$locked_on_gts/unfollow
+until_true 20 '[ "$(curl -s -H "$LH" "$P/api/v1/accounts/verify_credentials" | j "print(d[\"followers_count\"])")" = "0" ]' || true
 gcurl -s -o /dev/null -X POST -H "$GH" $G/api/v1/accounts/$locked_on_gts/follow
 until_true 20 '[ "$(curl -s -H "$LH" "$P/api/v1/follow_requests" | j "print(len(d))")" = "1" ]' && ok "gtsuser's follow waits on a locked persona" || ko "no follow request on the locked persona"
 [ "$(gcurl -s -H "$GH" "$G/api/v1/accounts/relationships?id[]=$locked_on_gts" | j "print(d[0][\"requested\"])")" = "True" ] && ok "GoToSocial shows the follow as requested" || ko "GoToSocial does not show the request"