fix: support Google Meet realtime barge-in (#73834)

Replay #73834 onto current main and preserve provider-side interruption when Google Meet detects a local human barge-in.

Thanks @shhtheonlyperson.

docs/.generated/config-baseline.sha256

@@ -1,4 +1,4 @@
-a69e6b650513c2a697ee51087928bf78f63ba998c7c60f8cca61dd65a0184fd0  config-baseline.json
+13b715c3aac380161ec167bccfcfb902c3231a802a08ab7ca9ef760e0c11913a  config-baseline.json
 0a259216178a582c567d1fa48c5236bff4bbd27c3e6af838ffcd042459ffce3c  config-baseline.core.json
-92712871defa92eeda8161b516db85574681f2b70678b940508a808b987aeae2  config-baseline.channel.json
-6005cf9f6e8c9f25ef97207b5eee29ae0e506cf910cdeca77fc9894ad1755b1f  config-baseline.plugin.json
+da8e055ebba0730498703d209f9e2cfaa1484a83f3240e611dcdd7280e22a525  config-baseline.channel.json
+8d41287cd9cb696cf8a5e8810bd731b9eda4af9b0829c6dadae2da56e19dc644  config-baseline.plugin.json

docs/plugins/google-meet.md

@@ -924,6 +924,16 @@ Defaults:
   and writing audio in `chrome.audioFormat`
 - `chrome.audioOutputCommand`: SoX command reading audio in `chrome.audioFormat`
   and writing to CoreAudio `BlackHole 2ch`
+- `chrome.bargeInInputCommand`: optional local microphone command that writes
+  signed 16-bit little-endian mono PCM for human barge-in detection while
+  assistant playback is active. This currently applies to the Gateway-hosted
+  `chrome` command-pair bridge.
+- `chrome.bargeInRmsThreshold: 650`: RMS level that counts as a human
+  interruption on `chrome.bargeInInputCommand`
+- `chrome.bargeInPeakThreshold: 2500`: peak level that counts as a human
+  interruption on `chrome.bargeInInputCommand`
+- `chrome.bargeInCooldownMs: 900`: minimum delay between repeated human
+  interruption clears
 - `realtime.provider: "openai"`
 - `realtime.toolPolicy: "safe-read-only"`
 - `realtime.instructions`: brief spoken replies, with
@@ -946,6 +956,24 @@ Optional overrides:
   chrome: {
     guestName: "OpenClaw Agent",
     waitForInCallMs: 30000,
+    bargeInInputCommand: [
+      "sox",
+      "-q",
+      "-t",
+      "coreaudio",
+      "External Microphone",
+      "-r",
+      "24000",
+      "-c",
+      "1",
+      "-b",
+      "16",
+      "-e",
+      "signed-integer",
+      "-t",
+      "raw",
+      "-",
+    ],
   },
   chromeNode: {
     node: "parallels-macos",
@@ -1028,6 +1056,8 @@ a session ended.
   not send the intro/test phrase into the audio bridge.
 - `providerConnected` / `realtimeReady`: realtime voice bridge state
 - `lastInputAt` / `lastOutputAt`: last audio seen from or sent to the bridge
+- `lastSuppressedInputAt` / `suppressedInputBytes`: loopback input ignored while
+  assistant playback is active
 
 ```json
 {
@@ -1448,6 +1478,14 @@ For clean duplex audio, route Meet output and Meet microphone through separate
 virtual devices or a Loopback-style virtual device graph. A single shared
 BlackHole device can echo other participants back into the call.
 
+With the command-pair Chrome bridge, `chrome.bargeInInputCommand` can listen to a
+separate local microphone and clear assistant playback when the human starts
+talking. This keeps human speech ahead of assistant output even when the shared
+BlackHole loopback input is temporarily suppressed during assistant playback.
+Like `chrome.audioInputCommand` and `chrome.audioOutputCommand`, it is an
+operator-configured local command. Use an explicit trusted command path or
+argument list, and do not point it at scripts from untrusted locations.
+
 `googlemeet speak` triggers the active realtime audio bridge for a Chrome
 session. `googlemeet leave` stops that bridge. For Twilio sessions delegated
 through the Voice Call plugin, `leave` also hangs up the underlying voice call.

docs/plugins/sdk-provider-plugins.md

@@ -593,6 +593,7 @@ API key auth, and dynamic model resolution.
             connect: async () => {},
             sendAudio: () => {},
             setMediaTimestamp: () => {},
+            handleBargeIn: () => {},
             submitToolResult: () => {},
             acknowledgeMark: () => {},
             close: () => {},
@@ -600,6 +601,10 @@ API key auth, and dynamic model resolution.
           }),
         });
         ```
+
+        Implement `handleBargeIn` when a transport can detect that a human is
+        interrupting assistant playback and the provider supports truncating or
+        clearing the active audio response.
       </Tab>
       <Tab title="Media understanding">
         ```typescript