fix: stabilize docs and tests after system event timestamps

src/auto-reply/reply/session-updates.test.ts

@@ -33,9 +33,7 @@ describe("prependSystemEvents", () => {
       second: "2-digit",
     });
 
-    expect(result).toContain(
-      `System: [${expectedTimestamp}] Model switched.`,
-    );
+    expect(result).toContain(`System: [${expectedTimestamp}] Model switched.`);
 
     resetSystemEventsForTest();
     vi.useRealTimers();

src/discord/monitor.slash.test.ts

@@ -31,7 +31,7 @@ beforeEach(() => {
 describe("discord native commands", () => {
   it(
     "streams tool results for native slash commands",
-    { timeout: 10_000 },
+    { timeout: 30_000 },
     async () => {
       const { ChannelType } = await import("@buape/carbon");
       const { createDiscordNativeCommand } = await import("./monitor.js");

src/discord/monitor.ts

@@ -179,7 +179,9 @@ export function registerDiscordListener(
   listeners: Array<object>,
   listener: object,
 ) {
-  if (listeners.some((existing) => existing.constructor === listener.constructor)) {
+  if (
+    listeners.some((existing) => existing.constructor === listener.constructor)
+  ) {
     return false;
   }
   listeners.push(listener);

src/infra/system-events.test.ts

@@ -47,7 +47,9 @@ describe("system events (session routing)", () => {
       isNewSession: false,
       prefixedBodyBase: "hi",
     });
-    expect(discord).toBe("System: Discord reaction added: ✅\n\nhi");
+    expect(discord).toMatch(
+      /^System: \[[^\]]+\] Discord reaction added: ✅\n\nhi$/,
+    );
     expect(peekSystemEvents("discord:group:123")).toEqual([]);
   });