{
	"description": "Edge case: kept tail is empty (operator cut at end of session). Templates render `(none)` and {% if last_user_message %} still resolves against the discarded span fallback.",
	"discarded": [
		{ "role": "user", "text": "Ship the feature." },
		{ "role": "assistant", "text": "Shipped." }
	],
	"kept_tail": []
}