Compose selected E1/E2 independent cards with Nexus rules

Retain selected decks and original optional modules through normal setup, distinguish native Ixian Betrayal from absent-faction replacement, route explicit CHOAM fuel before printed effects, and preserve native No-Field invoices and pair continuation. Connect canonical native cancellation stock and existing human/minimal AI consumers.

Validation: 194 affected tests across 19 files, types/lint/build, bounded native invoice review and seven finite original-action/rendered-control programmes. Runtime ec5ad6c18996d8d958ec0d01132ef3e3ea6d23d36188902eca9a63d4db2efbf8; documentation-only proof overlay a5892004937434429916496497c07a3838a324b4a5d64d4a0eb804ab5212d5bd. Other envelopes, full combinations, comprehensive assurance and deployed acceptance remain open. No saved-room/provider changes.

docs/IMPLEMENTATION_STATUS.md

@@ -1,5 +1,21 @@
 # Dune implementation status
 
+## 18 October 2026 — Selected E1/E2 independent Nexus
+
+Selected Ixian/CHOAM/combined38/50 composes independent cards and Nexus12 with
+original optional modules through normal host setup. Native Ix gets Betrayal;
+only absence gets purchased-card Secret Ally. CHOAM conversion bypasses printed
+fuel effects. Native typed fees/Harass/substitution/Face Dance and Richese
+pair/reveal/cache/Guild continuations use original sources and controls.
+
+Three disjoint helper/fixture lanes were integrated by one owner; bounded native
+invoice review found preflight and tariff issues, now repaired. Frozen19-file
+194/194, types/lint/build and seven finite original-action/rendered-control
+programmes pass. Fixture corrections preserve actual marker values, native
+ownership, affordability and unopened lotteries; no printed arithmetic changed.
+[Canonical proof and remaining boundaries](NEXUS_CARD_RULES.md#selected-e1e2-independent-nexus--18-october-2026).
+No saved-room/reset/restart/deployment; full modes and final assurance remain open.
+
 ## 18 October 2026 — Persistent room entry confirmations
 
 Successful create/join now shows the room code and concise invitation/seat