Improve interpretation depth by comparing today's projects and topics against previous reports.\n\nAcceptance criteria:\n- Mark new, recurring, rising, and cooling projects/topics.\n- Explain why a repeated trend matters instead of repeating the same summary.\n- Surface the delta in both generated JSON and frontend cards.
Improve interpretation depth by comparing today's projects and topics against previous reports.\n\nAcceptance criteria:\n- Mark new, recurring, rising, and cooling projects/topics.\n- Explain why a repeated trend matters instead of repeating the same summary.\n- Surface the delta in both generated JSON and frontend cards.