fix: deterministic weather → one clean Korean sentence (no 'Celsius')

getWeather now returns only the Korean sentence (지금 <곳> 날씨는 <상태>, 기온 N도
(체감 M도)입니다) with no English/°C source. A deterministic weather path in the
engine returns it verbatim, bypassing the 7B which was rephrasing into multiple
sentences and leaking 'Celsius'.

src/jarvis/tools/builtin/weather.py

@@ -440,17 +440,11 @@ class WeatherTool(Tool):
                 _ko_parts.append(_t)
             ko_sentence = ", ".join(_ko_parts) + "입니다."
 
-            # Build response text — concise current conditions (Korean sentence
-            # first so the model echoes it; English detail kept for any follow-up
-            # reasoning but the forecast firehose is dropped to curb rambling).
-            lines = [
-                f"한국어로 정확히 이 한 문장만 답하세요: {ko_sentence}",
-                f"(참고 데이터 — 답변에 추가하지 말 것: {location_display}, {weather_desc}, "
-                f"{temp_c}°C feels {feels_like_c}°C, humidity {humidity}%, wind {wind_speed}km/h)",
-            ]
-            # Forecast (hourly / 7-day) is intentionally omitted from the default
-            # voice reply to keep it to one spoken sentence; current conditions
-            # are what "날씨 알려줘" asks for.
+            # The reply is the clean Korean sentence ONLY — no English/°C source
+            # for the model to echo ("25도 Celsius"), no forecast firehose to
+            # ramble over. The deterministic weather path in the engine returns
+            # this verbatim; on the LLM path the model just echoes one sentence.
+            lines = [ko_sentence]
 
             reply_text = "\n".join(lines)