Dave's short follow-ups

Later classic Adventure already carries observed FunnyPvZ events into Dave's context. The retrieval previously required the current message to repeat a narrow keyword such as “sunflower”. A follow-up like “give them back” could lose the relevant early scene as the campaign grew.

Short referential follow-ups now retain the previous player message's subject. Explicit new subjects take precedence. Sunflower debt, name-only upgrades, Lily Pads and mowers select their relevant witnessed chapters. Assistant claims do not establish transactions; cycle, edition and earlier-save filtering remain in place. This does not grant refunds, modify combat, create debts or add automatic AI calls.

Validation: 355 NPC tests passed; full hosted build and typecheck passed. Tests cover English, Chinese and Spanish follow-ups, topic switches, irrelevant chatter and unverified assistant claims. This change is prompt context selection; generated dialogue remains model-dependent.