Reworked offer to switch to a newer model when resuming a session

What

When you resume an older session, Claude Code can offer to continue with a newer model. That offer was reworked:

• Remote config: a new remote setting, tengu_hidden_volcano, holds enabled, form (line or dialog), families, maxAsks, minHoursBetween and words. Its fallback is empty, so the offer does not appear unless the setting is sent. Nothing has been read about this setting.
• Two forms: the offer is either a notification showing the chat:defaultToNewerModel key hint, or a dialog. You can accept, decline or dismiss it.
• Wording: the prompt now reads "You’re resuming {an} {older} session." followed by "Press {key} to continue with {newer}."
• Who sees it: the suggestion (tengu_newer_model_suggestion) no longer checks your plan, zero data retention (ZDR) or allow_promo_offers. It now gives way to whichever announcement wins the single announcement slot, and it requires the form value from remote config.
• How often it asks: accepting now resets the ask count and last-asked time to zero. Any other outcome adds one ask and records the time. Counts are kept per newer model. A model you previously chose to keep no longer stops the offer; only maxAsks and minHoursBetween do.
• Errors: if showing the offer during resume fails, the failure is now recorded and passed on, and the offer can add and remove notifications.

Why

If you decline or keep your current model, you may be asked again later, up to the configured limit and spacing. Accepting starts the count over.