Edit a ChatGPT Ads campaign

Changes a campaign's name, status or spend limit. Both limits are decimals in the account currency: the lifetime limit is a hard ceiling on everything the campaign will ever spend, the daily limit paces it per day. A campaign has one or the other, never both, so pass only one of lifetime_budget and daily_budget — passing both is refused. Setting a daily budget on a lifetime campaign replaces the ceiling permanently: the platform cannot switch back, so read chatgpt_list_campaigns first and tell the user which kind of limit the campaign has now. Use when: renaming for clarity, or the user has decided to scale a campaign up or down and named the amount. Do not use it to pause or resume — chatgpt_pause_campaign and chatgpt_resume_campaign exist so the risk of that change is stated correctly to the user before they approve it. Do not lower the lifetime ceiling below what the campaign has already spent: the platform refuses it, and once a campaign is at its ceiling it stops delivering. Check spend with chatgpt_get_performance first. Returns the campaign read back from the platform after the change, so the new values are confirmed rather than assumed. At least one of name, status, lifetime_budget or daily_budget must be given. If the user says "increase the budget" without a number, ask which limit and how much. Never pick an amount for them.