Implement Tleilaxu and Ixian Nexus Cunning with durable private recovery

docs/IMPLEMENTATION_STATUS.md

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 # Dune implementation status
 
+**Tleilaxu and Ixian Nexus Cunning checkpoint, 10 September 2026:** [NEXUS_CUNNING_RUNTIME.md](NEXUS_CUNNING_RUNTIME.md) records atomic revealed Face Dancer replacement and full-strength Suboids in every battle for the rest of the turn. Basic and Advanced retain Cyborg support costs and exact physical losses. Review fixed fresh Ixian Nexus setup, future-plan search through an unspent Cunning card and its private preparation hint; prior commitments remain binding. **Types, lint, all 3,936 offline tests, production build and 40 HTTP/session tests pass.** Fifty-one new cases include real Face Dance, all four bots, mixed-force support, concurrent SQLite recovery and future Truthtrance/Prescience commitments. Desktop/phone card play, private refresh and a seven-strength/two-support sealed plan passed. The hourly restart preserved all **3,359** then-existing games; final comparison preserves all **3,327** opening room versions/hashes. Tleilaxu Secret Ally, Betrayal and remaining Nexus effects stay gated pending their recorded requirements. No expansion release gate opened; automation remains removed.
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 **Harkonnen Nexus exchange checkpoint, 10 September 2026:** [NEXUS_HARKONNEN_RUNTIME.md](NEXUS_HARKONNEN_RUNTIME.md) records draw-first Cunning and absent-faction Secret Ally, exact private returns, protected revealed Face Dancers, saved suspended actions and durable prior traitor declarations. Shared controls and all four bot profiles use projected identities. Independent review fixed lost preceding decisions and the paid Nullentropy action gate. **Types, lint, all 3,885 offline cases, production build and 40 HTTP/session cases pass.** Forty-six new cases cover rules, consumers, continuations and concurrent SQLite recovery. Two three-seat browser rooms passed draw/return, private restoration and desktop/phone inspection. All **3,295** preexisting room versions/hashes remain unchanged. Betrayal remains blocked pending the existing private response timing decision; complete Nexus and expansion games remain unfinished, and no release gate opens. The server was reused, no restart was due, and automation remains removed.
 
 **Atreides Nexus inspection checkpoint, 10 September 2026:** [NEXUS_ATREIDES_RUNTIME.md](NEXUS_ATREIDES_RUNTIME.md) records Cunning's distinct second commitment and absent-faction Secret Ally, physical card disposal, No-Field distinctions, private history, all four editor locks and bot handling. Independent review fixed lost-response bypass, first-answer drift and a sealed plan contradicting its signed observation; legitimate Residual reanswers preserve the first historical disclosure. **Types, lint, all 3,839 offline tests, production build and 40 HTTP/session tests pass.** Forty-four new cases include concurrent SQLite recovery and four independent corruption regressions. Three-seat keyboard play, answer, protected plan submission and desktop/phone refresh passed. All **3,234** preexisting room versions/hashes survived the scheduled backup/restart and final comparison. Betrayal response timing, Residual after two answered Cunning fields, other card families and complete module games remain explicitly unfinished; no release gate opened. Automation stays removed; verified checkpoints are authorized for push without another confirmation.