Require precipitation timing in generated text

internal/promptassets/assets/prompts/daily/daily_generated_text.user.md

@@ -8,8 +8,7 @@ Return these fields:
 
 - `summary`: required. One or two sentences summarizing the main weather story for the valid period.
 - `forecast_discussion`: required. Three paragraphs explaining the broader setup, trend, or forecast reasoning most relevant to the valid period.
-- `precipitation_timing`: optional. Include only when the deterministic `precip_timing` module contains precipitation windows.
-- `confidence`: optional. Include only if uncertainty, timing spread, or conflicting signals materially affect how the reader should interpret the forecast.
+- `precipitation_timing`: required. When the deterministic `precip_timing` module contains precipitation windows, provide the supported timing prose described below. Otherwise, return an empty string (`""`).
 
 Return JSON only.
 
@@ -27,7 +26,7 @@ In most cases, include three paragraphs: a two-to-four sentence relevant local o
 
 # Precipitation timing
 
-Include this only if precipitation is forecast. Use one to four sentences to give practical context about a supported frontal, convective, or stratiform setup; expected type, intensity, and duration; and uncertainty in onset or duration.
+When precipitation windows are present, use one to four sentences to give practical context about a supported frontal, convective, or stratiform setup; expected type, intensity, and duration; and uncertainty in onset or duration. When no precipitation windows are present, return an empty string (`""`) for `precipitation_timing`.
 
 # Narrative source selection
 

internal/promptassets/assets/prompts/daily/daily_generated_text.yml

@@ -1,5 +1,5 @@
 id: weather.daily_generated_text
-version: "1.0.0"
+version: "1.0.1"
 default_profile: gemini-flash-latest
 description: Daily weather report analysis prompt.
 inputs: