fix(google-meet): tighten realtime echo overlap

CHANGELOG.md

@@ -53,6 +53,7 @@ Docs: https://docs.openclaw.ai
 - Plugin tools: keep auth-unavailable optional tools hidden even when another default tool from the same plugin is available and `tools.alsoAllow` names the optional tool. Thanks @vincentkoc.
 - Realtime transcription: report socket closes before provider readiness as closed-before-ready failures instead of mislabeling them as connection timeouts for OpenAI, xAI, and Deepgram streaming transcription. Thanks @vincentkoc.
 - OpenAI/Google Meet: fail realtime voice connection attempts when the socket closes before `session.updated`, avoiding stuck Meet joins waiting on a bridge that never became ready. Thanks @vincentkoc.
+- Google Meet: avoid treating repeated participant words as multiple assistant-overlap matches when suppressing realtime echo transcripts. Thanks @vincentkoc.
 - QA/cache: require the full `CACHE-OK <suffix>` marker before live cache probes stop retrying, so suffix-only prose cannot hide a broken probe response. Thanks @vincentkoc.
 - Slack/Matrix: avoid creating blank progress-draft messages when `streaming.progress.label=false` and progress tool lines are disabled. Thanks @vincentkoc.
 - QA/Matrix: keep the mock OpenAI tool-progress provider aligned with exact-marker Matrix prompts so the hardened live preview scenario still forces a deterministic read before final delivery. Thanks @vincentkoc.

extensions/google-meet/index.test.ts

@@ -3857,6 +3857,13 @@ describe("google-meet plugin", () => {
         nowMs,
       }),
     ).toBe(false);
+    expect(
+      isGoogleMeetLikelyAssistantEchoTranscript({
+        transcript,
+        text: "yes yes yes yes",
+        nowMs,
+      }),
+    ).toBe(false);
   });
 
   it("uses a local barge-in input command to clear active Chrome playback", async () => {

extensions/google-meet/src/realtime.ts

@@ -173,9 +173,13 @@ function hasMeaningfulEchoOverlap(userTokens: string[], assistantTokens: string[
   if (userTokens.length < 4 || assistantTokens.length < 4) {
     return false;
   }
+  const uniqueUserTokens = [...new Set(userTokens)];
+  if (uniqueUserTokens.length < 4) {
+    return false;
+  }
   const assistantTokenSet = new Set(assistantTokens);
-  const overlap = userTokens.filter((token) => assistantTokenSet.has(token)).length;
-  return overlap / userTokens.length >= 0.58;
+  const overlap = uniqueUserTokens.filter((token) => assistantTokenSet.has(token)).length;
+  return overlap / uniqueUserTokens.length >= 0.58;
 }
 
 export function isGoogleMeetLikelyAssistantEchoTranscript(params: {