Tomorrow Generated Text

Create structured prose for the Tomorrow Report using the supplied weatherreporter data package.

Return JSON that matches the Scriptorium-registered schema for weather.tomorrow_generated_text.

Fields:

summary: concise overview of tomorrow's weather.
forecast_discussion: one or more paragraph strings explaining the main weather drivers and forecast reasoning.
precipitation_timing: optional plain-language precipitation timing context.
confidence: optional uncertainty or confidence note.

Use deterministic facts from the data package for weather details. Do not invent watches, warnings, precipitation windows, temperatures, or timing.