Discord: fix thread binding types in message/reply paths

src/discord/monitor/message-handler.process.ts

@@ -117,8 +117,9 @@ export async function processDiscordMessage(ctx: DiscordMessagePreflightContext)
     return;
   }
 
-  if (ctx.threadBinding?.threadId) {
-    threadBindings.touchThread({ threadId: ctx.threadBinding.threadId });
+  const boundThreadId = ctx.threadBinding?.conversation?.conversationId?.trim();
+  if (boundThreadId && typeof threadBindings.touchThread === "function") {
+    threadBindings.touchThread({ threadId: boundThreadId });
   }
   const ackReaction = resolveAckReaction(cfg, route.agentId, {
     channel: "discord",

src/discord/monitor/reply-delivery.ts

@@ -20,6 +20,7 @@ export type DiscordThreadBindingLookupRecord = {
 
 export type DiscordThreadBindingLookup = {
   listBySessionKey: (targetSessionKey: string) => DiscordThreadBindingLookupRecord[];
+  touchThread?: (params: { threadId: string; at?: number; persist?: boolean }) => unknown;
 };
 
 function resolveTargetChannelId(target: string): string | undefined {
@@ -272,6 +273,6 @@ export async function deliverDiscordReply(params: {
   }
 
   if (binding && deliveredAny) {
-    params.threadBindings?.touchThread({ threadId: binding.threadId });
+    params.threadBindings?.touchThread?.({ threadId: binding.threadId });
   }
 }

src/discord/monitor/thread-bindings.persona.test.ts

@@ -26,6 +26,7 @@ describe("thread binding persona", () => {
       agentId: "codex",
       boundBy: "system",
       boundAt: Date.now(),
+      lastActivityAt: Date.now(),
       label: "codex-thread",
     } satisfies ThreadBindingRecord;
     expect(resolveThreadBindingPersonaFromRecord(record)).toBe("⚙️ codex-thread");