refactor(src): split oversized modules

src/web/auto-reply/monitor/echo.ts

@@ -0,0 +1,63 @@
+export type EchoTracker = {
+  rememberText: (
+    text: string | undefined,
+    opts: {
+      combinedBody?: string;
+      combinedBodySessionKey?: string;
+      logVerboseMessage?: boolean;
+    },
+  ) => void;
+  has: (key: string) => boolean;
+  forget: (key: string) => void;
+  buildCombinedKey: (params: {
+    sessionKey: string;
+    combinedBody: string;
+  }) => string;
+};
+
+export function createEchoTracker(params: {
+  maxItems?: number;
+  logVerbose?: (msg: string) => void;
+}): EchoTracker {
+  const recentlySent = new Set<string>();
+  const maxItems = Math.max(1, params.maxItems ?? 100);
+
+  const buildCombinedKey = (p: { sessionKey: string; combinedBody: string }) =>
+    `combined:${p.sessionKey}:${p.combinedBody}`;
+
+  const trim = () => {
+    while (recentlySent.size > maxItems) {
+      const firstKey = recentlySent.values().next().value as string | undefined;
+      if (!firstKey) break;
+      recentlySent.delete(firstKey);
+    }
+  };
+
+  const rememberText: EchoTracker["rememberText"] = (text, opts) => {
+    if (!text) return;
+    recentlySent.add(text);
+    if (opts.combinedBody && opts.combinedBodySessionKey) {
+      recentlySent.add(
+        buildCombinedKey({
+          sessionKey: opts.combinedBodySessionKey,
+          combinedBody: opts.combinedBody,
+        }),
+      );
+    }
+    if (opts.logVerboseMessage) {
+      params.logVerbose?.(
+        `Added to echo detection set (size now: ${recentlySent.size}): ${text.substring(0, 50)}...`,
+      );
+    }
+    trim();
+  };
+
+  return {
+    rememberText,
+    has: (key) => recentlySent.has(key),
+    forget: (key) => {
+      recentlySent.delete(key);
+    },
+    buildCombinedKey,
+  };
+}