Public threads name their replies and context

Owner decision of 2026-10-06: a persona's public or unlisted post outside any group names its replies
(…/scribbles/{id}/replies) and its conversation's context (FEP-7888), the root's …/context that a reply inherits from
its parent, ours or another server's. Both list only the public and unlisted posts PrivaPub holds; followers-only,
circle, direct and local-only posts name neither and their collections answer 404. Checked live: opening alice's
thread on Mastodon finds carol's reply, which nobody there follows (scenarios/threads.sh).

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

tools/pasture/scenarios/threads.sh

@@ -0,0 +1,32 @@
+# Public threads elsewhere (owner decision 2026-10-06): alice's public post names its `replies` and `context`, so a
+# Mastodon reader who follows alice, opening the thread, finds carol's reply although nobody on Mastodon follows carol
+# (Mastodon reads a thread's replies at most every fifteen minutes, five minutes after it first holds the post: the
+# scenario makes its copy look older). Needs the mastodon peer.
+M=https://mastodon.test:6443
+mcurl() { curl -sk --resolve mastodon.test:6443:127.0.0.1 "$@"; }
+. "$here/peers/mastodon.sh"
+m_rails() { podman exec pasture-mastodon bin/rails runner "$1" 2>/dev/null | tail -1; }
+
+echo "threads"
+AT=$(privapub_token alice_thread); CT=$(privapub_token carol_thread)
+[ -n "$AT" ] && [ -n "$CT" ] && ok "PrivaPub tokens for alice_thread and carol_thread" || { ko "PrivaPub tokens"; return 1; }
+MT=$(mastodon_token)
+MH="Authorization: Bearer $MT"
+run=$(date +%s)
+
+alice_on_m=$(mcurl -H "$MH" "$M/api/v2/search?q=@alice_thread@privapub.test&resolve=true&type=accounts" | j "print(d['accounts'][0]['id'])")
+mcurl -o /dev/null -X POST -H "$MH" "$M/api/v1/accounts/$alice_on_m/follow"
+until_true 45 '[ "$(mcurl -H "$MH" "$M/api/v1/accounts/relationships?id[]=$alice_on_m" | j "print(d[0][\"following\"])")" = "True" ]' \
+	&& ok "mastouser follows alice" || ko "mastouser never followed alice"
+
+root=$(curl -s -X POST -H "Authorization: Bearer $AT" "$P/api/v1/statuses" -d "status=a question for the thread $run&visibility=public")
+root_uri=$(echo "$root" | j "print(d['uri'])")
+reply_uri=$(curl -s -X POST -H "Authorization: Bearer $CT" "$P/api/v1/statuses" -d "status=an answer from carol $run&visibility=public&in_reply_to_id=$(echo "$root" | j "print(d['id'])")" | j "print(d['uri'])")
+until_true 45 '[ "$(m_rails "puts Status.exists?(uri: \"$root_uri\")")" = "true" ]' && ok "alice's post reaches Mastodon" || ko "alice's post never reached Mastodon"
+[ "$(m_rails "puts Status.exists?(uri: \"$reply_uri\")")" = "false" ] && ok "carol's reply is not delivered there" || ko "carol's reply reached Mastodon unasked"
+
+m_rails "Status.find_by(uri: \"$root_uri\").update_columns(created_at: 10.minutes.ago, fetched_replies_at: nil)" >/dev/null
+root_on_m=$(m_rails "puts Status.find_by(uri: \"$root_uri\").id")
+mcurl -o /dev/null -H "$MH" "$M/api/v1/statuses/$root_on_m/context"
+until_true 60 '[ "$(m_rails "puts Status.exists?(uri: \"$reply_uri\")")" = "true" ]' \
+	&& ok "opening the thread on Mastodon finds carol's reply through its replies" || ko "Mastodon never found carol's reply"