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/reply/engine.py

@@ -889,6 +889,37 @@ def _maybe_deterministic_site_search(text: str, db, cfg, language) -> Optional[s
     return None
 
 
+_WEATHER_INTENT_WORDS = (
+    "날씨", "기온", "더워", "더운", "추워", "추운", "비 와", "비와", "비 올",
+    "눈 와", "눈와", "weather", "temperature", "forecast",
+)
+
+
+def _maybe_deterministic_weather(text: str, db, cfg, language) -> Optional[str]:
+    """Run getWeather directly and return its concise Korean sentence, bypassing
+    the chat model. The 7B otherwise re-synthesises the weather into multiple
+    sentences and leaks units ("25도 Celsius"); the tool already formats one
+    clean Korean sentence, so for a plain weather ask we just return it.
+    Fail-open: any problem returns None and the normal flow continues.
+    """
+    try:
+        low = (text or "").lower()
+        if not any(w in low for w in _WEATHER_INTENT_WORDS):
+            return None
+        from ..tools.registry import run_tool_with_retries
+        res = run_tool_with_retries(
+            db=db, cfg=cfg, tool_name="getWeather", tool_args={},
+            system_prompt="", original_prompt="", redacted_text=redact(text),
+            max_retries=1, language=language,
+        )
+        if res and getattr(res, "success", False) and res.reply_text:
+            debug_log("deterministic weather executed", "tools")
+            return res.reply_text
+    except Exception as e:  # noqa: BLE001
+        debug_log(f"deterministic weather failed (fail-open): {e}", "tools")
+    return None
+
+
 def run_reply_engine(db: "Database", cfg, tts: Optional[Any],
                     text: str, dialogue_memory: "DialogueMemory",
                     language: Optional[str] = None) -> Optional[str]:
@@ -920,6 +951,13 @@ def run_reply_engine(db: "Database", cfg, tts: Optional[Any],
     if _site_search_reply is not None:
         return _site_search_reply
 
+    # Step 0.6: Deterministic weather — return getWeather's concise Korean
+    # sentence directly so the chat model can't rephrase it into multiple
+    # sentences or leak units.
+    _weather_reply = _maybe_deterministic_weather(text, db, cfg, language)
+    if _weather_reply is not None:
+        return _weather_reply
+
     # Step 2: Check for recent dialogue context
     recent_messages = []
     is_new_conversation = True