Implement five CHOAM Nexus Cunning effects with private costs and recovery

docs/IMPLEMENTATION_STATUS.md

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 # Dune implementation status
 
+**CHOAM Nexus Cunning checkpoint, 10 September 2026:** [NEXUS_CHOAM_RUNTIME.md](NEXUS_CHOAM_RUNTIME.md) records five native effects using one actual Treachery Card in Basic and Advanced. Shared controls inspect the real cost independently of the selected effect; all four bots use projected legality. Karama retains the cost and spent Nexus; actual intervening cash-in fizzles and resumes the original operation. Independent review fixed saved movement, revival and storm orders accepting valid-looking replacements. **Types, lint, all 4,042 offline tests, production build and 40 HTTP/session tests pass.** Thirty new cases include real paid Nullentropy, private views, physical disposal and concurrent SQLite outcomes. Two three-seat browser rooms passed phone declarations, allowance/cancellation and all six private refreshes. All **3,484** opening room versions/hashes remain unchanged; only two browser and thirty HTTP rooms were added. The printed family has six effects: Kull Wahad remains unavailable, as do unfinished Secret Ally/Betrayal and full module starts. Existing server reused, no restart due, automation remains removed.
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 **Grumman stack cancellation checkpoint, 10 September 2026:** [GRUMMAN_PLACEMENT_CANCELLATION.md](GRUMMAN_PLACEMENT_CANCELLATION.md) records the reproduced failure of printed Karama against a native Mentat placement after a legal Collection stack. Cancellation now preserves the existing stack without requiring distinct occupied locations. Independent SQL review also fixed allowance accepting unrelated duplicate physical token IDs; both outcomes validate the same inventory. Existing denial semantics remain unchanged. **Types, lint, all 4,012 offline cases, production build and 40 HTTP/session cases pass.** Six new cases cover Basic/Advanced, low population, unchanged income, competing cancellation/allowance, private restoration and malformed records. Browser phone declaration, desktop/phone cancellation and three-seat refresh pass. The hourly restart preserved all **3,453** opening games and restored twelve earlier private seats; final comparison leaves those same versions/hashes unchanged, with one new browser room and thirty HTTP rooms added. New [Ixian replacement](NEXUS_IXIAN_REPLACEMENT_RULES.md) and [Fremen Nexus](NEXUS_FREMEN_RULES.md) audits record remaining source and privacy boundaries. No new Nexus effect or release gate was enabled; automation stays removed.
 
 **Emperor Nexus Cunning checkpoint, 10 September 2026:** [NEXUS_SARDAUKAR_RUNTIME.md](NEXUS_SARDAUKAR_RUNTIME.md) records five ordinary counters temporarily using Sardaukar strength and support in one Advanced battle. Physical counters, starred reserves and ordinary losses remain distinct. Shared editor and bot calculations handle the Fremen exception and Salusa support. Review fixed a canceled-enhancement Prescience deadlock and retained durable winner casualty choices across competing SQLite requests. **Types, lint, all 4,006 offline tests, production build and 40 HTTP/session tests pass.** Thirty-five new cases cover independent counter arithmetic, real Homeworld thresholds, future commitments, hidden information and recovery. Two three-seat browser rooms passed desktop/phone allowance, cancellation, reanswer, sealed planning and private refresh. All **3,421** opening room versions/hashes remain unchanged; only thirty HTTP rooms and two browser rooms were added. Fewer-than-five interpretation, Emperor Secret Ally, Betrayal and complete module acceptance remain gated. No release gate opened; no restart was due, and automation remains removed.