Dave's slower shuffle

4-1 can now answer an explicit request for a slower replay, including a complaint about witnessed sunflower interest. The native game repeats the same committed five swaps once, then still permits the player to make Dave open an empty box. This is an extension of the existing gift scene, not a new plot every level or a refund mechanic.

The optional replayAvailable capability is checked against the current stage and revision. Old clients do not receive the new decision. The model never receives the shuffle path or concealed prize. Native stage/revision already serialize the replay; no save-format change is needed. An observed replay becomes a campaign-scoped callback, not another reward.

The game client preserves the generated gift reply after a successful action; it previously replaced the response with stock dialogue. Static gift lines are shorter in English and Chinese. Normal non-AI choices remain complete.

Validation before host integration:

• 338 NPC library tests passed, including account context, scene choices, stale decisions, privacy, money and campaign scope.
• Monorepo build and typecheck passed.
• Two real requests through the designated development account's saved private provider and persona chose replay decision7 in English and Chinese. The Chinese reply referred to the interest and agreed to slow down. Neither response contained model/engine explanations. The database transaction was read-only; no production account or billing record was changed.
• Native checks cover unchanged contents and sun, one replay, save/reload, dud opening, single payout and resumed combat.

Public billing/cross-device saves, physical phones and advertising-scale load remain separate unverified launch gates. Browser fixtures establish UI/native/service integration, not a live production account session. Local receipts: output/payoff-host-tests.log, output/payoff-host-build.log, output/payoff-host-typecheck.log, output/payoff-live.json.