Relays: PrivaPub reads from the relays its configuration names

Federation:Relays names relays by their actor (or inbox) address; the instance actor follows Public at each, as Mastodon
subscribes, a minute after start and every six hours (asked again a day after no answer or a refusal, undone when a
relay is no longer named). What an accepted relay passes on comes to the federated timeline and nobody's home: a public
post it forwards (Activity-Relay), read again from its origin like any forwarded post, and a post it announces
(aode-relay), kept as its author's and never as the relay's boost. Nothing of a persona's is sent to a relay; sending
public posts there waits for the owner.

The pasture gains both relays (peers/relay.sh, peers/aoderelay.sh) and scenarios/relay.sh, 13 checks. The village
backlog is clean: 2574 checks pass, one known gap (Misskey's).

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

docs/INTEROP.md

@@ -753,6 +753,20 @@ PeerTube's own instance account announces each new video too, which we drop: nob
 follow only PeerTube-like channels and accounts, never a persona. It checks the `Host` header against its own name,
 without a port, before it gives out its OAuth client.
 
+### Relays: Activity-Relay 2.0.9 and aode-relay 0.3.129
+
+- **Activity-Relay** takes a subscription as a `Follow` of `Public` from an actor with a shared inbox (Mastodon's way)
+  and passes every public activity a subscriber sends on to the others as it came, signed with the relay's key; only a
+  follower whose actor ends in `/relay` (LitePub's way) gets an `Announce` instead.
+- **aode-relay** takes either kind and announces the post from its own actor.
+- A forwarded post carries its author's LD signature when Mastodon wrote it; PrivaPub does not verify LD signatures,
+  so it reads every relayed post again from its origin (one signed request each). Verifying them, or FEP-8b32 proofs,
+  would save that request.
+- **Pasture evidence (2026-10-05, `tools/pasture/scenarios/relay.sh`):** 13 checks pass: PrivaPub's instance actor
+  subscribes to each relay and takes its Accept; Mastodon subscribes; a public post of a Mastodon account nobody here
+  follows reaches the federated timeline, forwarded by Activity-Relay and announced by aode-relay (as its author's,
+  never as the relay's boost), and nobody's home; nothing of a persona's goes to a relay.
+
 ### Smithereen 1.0.3
 
 - **Walls:** a post is a `Note`; one written on someone else's wall carries the wall (`sm:wall`, FEP-400e) as its