Add deterministic post-action coach

CLAUDE.md

@@ -57,12 +57,14 @@ export JAVA_HOME="/Applications/Android Studio.app/Contents/jbr/Contents/Home"
 6. **Pot odds are the post-flop baseline.** Never apply a blanket implied-odds
    discount: it is categorically wrong on the river, and future value on earlier
    streets must account for future costs and reverse implied odds before it is
-   called an advantage.
+   called an advantage. Price a call against `eligiblePot`, not the displayed
+   total: a short stack cannot win side-pot chips above its contribution level.
 7. **DecisionTrace is the coach contract.** It records raw pot odds, the actual
    adjusted threshold, every adjustment, intended and chosen actions, and whether
    a skill error changed the decision. Pre-flop chart percentile/range fields are
    structurally separate from post-flop equity fields; inapplicable values are
-   null. The coach explains these values; it does not reconstruct hidden bot logic.
+   null. The production coach explains these values; it does not reconstruct
+   hidden bot logic.
 
 ## Testing notes
 
@@ -118,6 +120,11 @@ export JAVA_HOME="/Applications/Android Studio.app/Contents/jbr/Contents/Home"
 - A cash-game session begins at an explicit take-a-seat screen. Opponents may
   auto-reload below the big blind; the human is never silently topped up and must
   explicitly choose "Reload to N & deal" from the completed-hand screen.
+- The deterministic coach is opt-in and post-action only. Its fundamentals
+  baseline receives `DecisionOffer`, so it can see the hero's cards and public
+  table state but no opponent hole cards. Post-flop equity is explicitly labelled
+  as an estimate against unknown random hands; disagreement is "worth reviewing,"
+  never declared solver proof of a mistake.
 - Gradle emits an `archives` deprecation from the Kotlin Multiplatform plugin's
   own `jvm()` target registration — upstream in Kotlin 2.2.10, not our build.
-- Not built yet: LLM persona layer and opt-in coach.
+- Not built yet: LLM persona layer.