Prototype CHOAM Nexus Collection trade and inventory Discoveries

An unallied player holding CHOAM Nexus while CHOAM is absent can now discard one Worthless card during Spice Collection for two bank spice. The server spends both physical cards once, exposes only private legal card choices, and persists an already-paid discard receipt. Human controls and all four AI profiles share the action. The after-victory inspection alternative remains missing; normal unfinished modes and publication stay gated.

Independent review caught and fixed a queued Grumman Collection lock mismatch. Focused tests cover Basic/Advanced, actual card custody, private controls, all AI profiles, stale and wrong-mode rejection, Truthtrance and Grumman locks, JSON corruption/replay, competing production SQLite writes and private seat restoration.

A separate bounded acquisition helper recorded all seven Discovery Spice Cards, eight tokens and exact physical card placements from publisher-authored sources. Discovery runtime remains missing.

Validation: types, lint, 4,217 offline tests, production build and 40 HTTP tests passed. Durations: check 139298 ms; build 6617 ms; HTTP 24329 ms. Source fingerprint dfdaaf8bafe69acd31c9d0afc13f7a0d070da43deb544f091e95fe840b399493; private report under ~/.local/share/dune/checkpoints/20260913-choam-nexus-trade/verification/report.json. Browser reference search, Prototyped label and related Collection link checked. All 95 opening saved rooms unchanged; 30 HTTP test rooms added, 125 total. No server restart or database reset.

Efficiency counter: 59,982,405 at batch start; 60,581,959 after broad verification, delta 599,554 aggregate tokens before final preservation/Git/usage checks. One newly playable function plus the acquired Discovery inventory; this is not full CHOAM or Nexus compliance.

docs/EFFICIENCY_PILOT.md

@@ -82,3 +82,12 @@ leave the removed recurring automation absent. After `32791ed`, usage was 3% use
 Use [current status](CURRENT_STATUS.md), [rule decisions](RULE_DECISIONS.md) and
 [verification workflow](VERIFICATION_WORKFLOW.md) as short entry points. Historical
 logs remain references, not mandatory full-context input on every turn.
+
+The next rapid prototype batch begins at aggregate counter 59,982,405 and adds
+one missing action: CHOAM Nexus Secret Ally Collection trade. A workhorse helper
+acquires the complete Discovery inventory for the following batch; a reused
+independent reviewer checks this trade and its queued-Collection lock. The owner
+connects runtime, private controls, AI and SQLite recovery. The battle inspection
+alternative stays explicitly missing instead of holding the independent trade
+for an exhaustive battle-cleanup design. Final checks, counter endpoint and
+checkpoint scope are recorded in the commit.