Idioms Layer: Natural Rewrite with Guardrails

Prompt: You are rewriting the provided text to sound natural and native. You MAY optionally use up to ONE of the suggested idioms below. Pattern: retrieve 5–10 idiom candidates for the topic, optionally filter by frequency (common idioms only); feed 1–2 candidates into the prompt as optional suggestions with their meanings; instruct the model to use at most one and only if it fits the register. Constraints: - Do not change factual content. - Avoid forced or culturally niche idioms. - Prefer common idioms unless explicitly asked for creative/rare phrasing. Suggested idioms (optional): 1) "<IDIOM_1>" — meaning: "<MEANING>" — example: "<EXAMPLE>"; 2) "<IDIOM_2>" — meaning: "<MEANING>" — example: "<EXAMPLE>".