feat: refine assistant logic and update docs

.env.example

@@ -6,6 +6,11 @@ AI_PROVIDER=
 # OPENROUTER_API_KEY=your_openrouter_api_key_here
 OPENROUTER_MODEL=openai/gpt-4o-mini
 OPENROUTER_API_URL=https://openrouter.ai/api/v1/chat/completions
+AI_CHAT_TEMPERATURE=0.9
+AI_CHAT_MAX_TOKENS=160
+AI_CHAT_MAX_CHARS=240
+AI_INTENT_TEMPERATURE=0.0
+AI_TRANSLATION_TEMPERATURE=0.2
 
 # OpenAI
 # OPENAI_API_KEY=your_openai_api_key_here
@@ -35,6 +40,13 @@ OLLAMA_API_URL=http://localhost:11434/v1/chat/completions
 DEEPGRAM_API_KEY=your_deepgram_api_key_here
 PORCUPINE_ACCESS_KEY=your_porcupine_access_key_here
 PORCUPINE_SENSITIVITY=0.8
+# Anti-phantom wake word filter (RMS gate).
+# Increase values if random activations persist; lower them if wake word becomes too hard to trigger.
+# If the mic reopens and instantly re-triggers, keep RMS as-is and raise WAKEWORD_REOPEN_GRACE_SECONDS.
+# WAKEWORD_MIN_RMS=120
+# WAKEWORD_RMS_MULTIPLIER=1.7
+# WAKEWORD_HIT_COOLDOWN_SECONDS=1.2
+# WAKEWORD_REOPEN_GRACE_SECONDS=0.45
 # Optional audio device overrides (substring match by name or exact PortAudio index)
 # AUDIO_INPUT_DEVICE_NAME=pulse
 # AUDIO_INPUT_DEVICE_INDEX=2