Add gated turn start strategy

README.md

@@ -154,6 +154,9 @@ before declaring the turn done) is configurable per environment:
     "stop_secs": 0.6,
     "min_volume": 0.6
   },
+  "interruption_min_chars": 3,
+  "interruption_use_interim": true,
+  "interruption_short_replies": ["是的", "行", "可以"],
   "user_speech_timeout_sec": 1.0
 }
 ```
@@ -162,6 +165,13 @@ before declaring the turn done) is configurable per environment:
   controls the Silero VAD. `stop_secs` is the duration of silence required
   before VAD reports the user stopped speaking; raise it if VAD is
   cutting users off mid-clause, lower it for snappier turn-taking.
+- `interruption_min_chars`, `interruption_use_interim`, and
+  `interruption_short_replies` configure the custom turn-start gate used
+  while the assistant is speaking. Short replies in the allowlist (for
+  example, `是的`, `行`, `可以`) can barge in immediately; other text must
+  contain at least `interruption_min_chars` countable characters after
+  punctuation and spaces are removed. This keeps common yes/no answers while
+  filtering brief background speech.
 - `user_speech_timeout_sec` is the additional grace window (used by
   `SpeechTimeoutUserTurnStopStrategy`) during which the user may resume
   speaking before the aggregator finalizes the turn. The timer is