Restore native Ecaz simulation continuation and current rule fixtures

Match original Ecaz sample snapshots to their native Occupy and Advanced assassination state. Preserve older absent-power samples and resume the original scenario instead of rejecting fresh saved output. Update stale fixture reactions and module expectations while retaining meaningful Banker guidance and positive legal commitments. Correct the unsupported rules-completion claim.

Validation: typecheck/lint, 173 affected tests across 16 files, bounded independent source review, and one direct Ecaz continuation completed through 178 accepted actions. Runtime fingerprint 95d009d3957650b08bb24826b70aa5f00a74cdd9992b6a6c222f0665d3e3759c; documentation-only proof update a91ab248109bee74a74373fb544027a2e7cc8f178e26d2c9dad475a9618eb64d. Full rules, comprehensive assurance and deployed acceptance remain open. No saved-room or provider changes.

tests/nexus-emperor-purchase-engine.test.ts

@@ -69,7 +69,11 @@ void test('a prior normal purchase cannot authorize spending Emperor Nexus on a
   reject(revised, owner, first, /current Emperor Nexus/i);
   g = applyAction(g, owner, { type: 'decision', karama: false });
   for (let i = 0; g.decision?.kind !== 'auctionPayment' && i < 20; i++) {
-    if (g.auction?.active === owner && !g.auction.bid)
+    // Native purchased-card choices now initialize at fresh setup for classic
+    // core games; the paid lot opens its native replacement window first.
+    if (g.decision?.kind === 'nexusIxianReplacement')
+      g = applyAction(g, g.decision.player, { type: 'nexusIxianReplacementPass', event: g.decision.event });
+    else if (g.auction?.active === owner && !g.auction.bid)
       g = applyAction(g, owner, { type: 'bid', amount: 2 });
     else if (g.auction)
       g = applyAction(g, g.auction.active, { type: 'passBid' });
@@ -90,8 +94,10 @@ void test('invalid normal-lot custody and full winning hand cannot spend the phy
   const action = { type: 'nexusEmperorPurchase', event: viewGame(g, owner).nexusEmperorSecretAlly!.event };
   const duplicate = nexusReload(g);
   duplicate.deck.push(structuredClone(g.auction!.cards[g.auction!.index]));
-  assert.match(viewGame(duplicate, owner).nexusEmperorSecretAlly!.purchase!.blocked!, /conflicting physical custody/);
-  reject(duplicate, owner, action, /conflicting physical custody/);
+  // Duplicate card custody is now rejected by the native purchased-card
+  // integrity check before the Emperor purchase gate is even consulted.
+  assert.throws(() => viewGame(duplicate, owner), /single physical custody/);
+  reject(duplicate, owner, action, /single physical custody/);
   const full = nexusReload(g);
   full.players.find(p => p.id === owner)!.hand.push(...full.deck.splice(0, 4));
   assert.match(viewGame(full, owner).nexusEmperorSecretAlly!.purchase!.blocked!, /room for the committed/);