feat: offer Semuta after clean battle Distrans transfers

docs/RICHESE_DISTRANS_ENGINE_AUDIT.md

@@ -30,7 +30,7 @@ The distinction between an ordinary Treachery effect and a cancellable faction/a
 1. **Giving the activating Distrans itself.** The give-then-discard wording does not explain self-selection. Do not put the same physical card in both the recipient's hand and the discard, discard a different card, or silently omit the discard. Until clarified, require a separate transferred card and label self-selection unsupported, not a printed prohibition.
 2. **Exact scope of “during a bid.”** The face does not define whether this means one bid declaration or the complete auction of a card. It does not say the entire Bidding phase. A temporary guard over unresolved normal/Once Around/Silent lots, including unsettled payment, is an explicit conservative implementation boundary. Pre-bid declaration/selection, between-lot windows and post-purchase income are distinct contexts; do not silently present a blanket phase-3 ban as the official rule. The user has already been asked about this boundary by root; this audit adds no question or assumed answer.
 3. **Active Truthtrance answer priority.** Existing question/priority resolution prevents changing the queried hand mid-question. No retrieved Distrans-specific rule overrides it. Keep this narrow existing priority boundary, rather than disabling Distrans for every unrelated decision or response.
-4. **Future Semuta discard reaction.** Discarding Distrans creates a real discard event. Semuta may eventually react to that card; the transferred card was not discarded and is not a Semuta target. Do not replay the transfer when resuming a future discard reaction. The exact combined Semuta capacity/counter sequence remains in its own unfinished subsystem.
+4. **Semuta discard reaction — updated 11 October 2026.** The explicit development preview reacts after a clean completed transfer, including during battle. Only the used Distrans is fresh; the privately transferred card is never a Semuta target. Claim or decline cannot repeat the transfer or change a sealed plan. The recipient may itself hold Semuta and claim the used card while keeping the earlier gift. Competing parents retain their separate boundaries; the neutral response and approved full-hand exchange are documented in [the Semuta source/runtime contract](SEMUTA_SOURCE_UPDATE_20260907.md).
 
 A setup-only prohibition is also not printed on the face. Current supported setup normally has no reachable Distrans in a hand; if a new setup module makes that reachable, verify that boundary rather than inferring a general rule from current implementation gates.