Enable Basic Nexus Kull and native reactions

README.md

@@ -248,13 +248,14 @@ the specific Karama effect; Basic retains phase-wide prevention. Advanced phase
 expiry is provisional. Unpayable overbid recovery remains guarded. See the [selected policy and boundaries](docs/CHOAM_KULL_SOURCE_UPDATE.md).
 This does not enable public expansion starts or certify full CHOAM.
 
-For local **CHOAM Nexus Cunning Kull**, use `node --import tsx tools/start-prototype.ts --profile nexus-kull`
-on a fresh ready Basic/Advanced CHOAM-plus-classic lobby with `choam,ix` Treachery
-and Nexus alone. It omits physical Sandtrout. The same exact-version/private-backup
-safeguards apply. Choose printed Kull or a canonical own Treachery fuel:
+Fresh Basic CHOAM-plus-classic games with `choam,ix` decks and Nexus alone now
+enable the **CHOAM Nexus Cunning Kull** preview by default; the host can turn
+it off. The original Ix Sandtrout remains in the Spice deck. The separate
+local Basic/Advanced audit uses `node --import tsx tools/start-prototype.ts --profile nexus-kull`
+with the same exact-version/private-backup safeguards. Choose printed Kull or a canonical own Treachery fuel:
 Nexus spends on accepted declaration, fuel only on success; distinct prevention
 retains fuel while leaving Nexus spent. See [verified bounded runtime and limits](docs/NEXUS_CHOAM_RUNTIME.md#bounded-nexus-kull-profile).
-Older printed-only games do not gain Nexus choices, and public starts stay gated.
+Older printed-only games do not gain Nexus choices; other combinations remain incomplete.
 
 For local **Richese Nexus Betrayal** testing, use `node --import tsx tools/start-prototype.ts --profile richese-betrayal`
 on a fresh ready Basic/Advanced CHOAM/Richese-plus-classic lobby with the `choam`