fix(host): list an unreachable peer's channels as offline instead of dropping them

.lane/memory/apps/host/src/peers.ts/01M4YQFNJCJ32A99NQC28NQ6T9-without-a-team-directory-a-p.md

@@ -0,0 +1,12 @@
+---
+id: 01M4YQFNJCJ32A99NQC28NQ6T9
+anchor: function unreachable
+created: 2026-10-15T02:50:26Z
+norm: '1'
+sig: dafb01d962243d11
+body_hash: b1750761c8fca9d0
+raw_hash: 4da6cfbe96c64428
+lines: 93-97
+---
+
+without a team directory, a peer's last answer is the only record of its channels; dropping it on disconnect hides open conversations

apps/host/src/gateway.ts

@@ -104,9 +104,14 @@ function local(): Listing[] {
 	});
 }
 
-/** Channels only the directory knows: their host is unreachable, unless they are hosted. */
+/** Channels only the directory or a peer's last answer knows: their host is unreachable, unless they are hosted. */
 function listed(seen: Set<string>): Listing[] {
-	return directory.read().channels.filter((value) => !seen.has(value.id) && value.host !== name)
+	return [...directory.read().channels, ...peers.unreachable()]
+		.filter((value) => {
+			if (seen.has(value.id) || value.host === name) return false;
+			seen.add(value.id);
+			return true;
+		})
 		.map((value) =>
 			Object.assign({}, value, {
 				state: value.state === "archived" || value.hosted ? value.state : "offline" as const,

apps/host/src/peers.ts

@@ -21,6 +21,8 @@ type Peer = { machine: Machine; client: GatewayClient; github?: string };
 /** One listing connection per online peer, kept only while the peer answers. */
 const hosts = new Map<string, Peer>();
 const listeners = new Set<() => void>();
+/** Each peer's channels as it last answered, listed as offline while the peer is unreachable. */
+const remembered = new Map<string, Listing[]>();
 
 function emit() {
 	for (const listener of listeners) listener();
@@ -58,6 +60,7 @@ async function discover(signal: AbortSignal) {
 				});
 				status = client.status;
 			}
+			if (client.status === "open") remembered.set(name, client.channels);
 			emit();
 		});
 		hosts.set(name, host);
@@ -86,6 +89,13 @@ export function listings(): Listing[] {
 	);
 }
 
+/** Channels of peers that answered before but are unreachable now. */
+export function unreachable(): Listing[] {
+	return [...remembered].flatMap(([name, channels]) =>
+		hosts.get(name)?.client.status === "open" ? [] : channels
+	);
+}
+
 /** Reachable peers' owners' GitHub logins. */
 export function people(): People {
 	const people: People = {};