Persist cross-session coach history

CLAUDE.md

@@ -68,6 +68,11 @@ export JAVA_HOME="/Applications/Android Studio.app/Contents/jbr/Contents/Home"
    structurally separate from post-flop equity fields; inapplicable values are
    null. The production coach explains these values; it does not reconstruct
    hidden bot logic.
+8. **Persist aggregates, not surveillance.** Player history stores the schema
+   version, setup preference, session/hand counts, baseline agreement, and stable
+   review-category counters. It never stores hole cards, boards, opponents, or
+   raw action histories. Storage mutations are serialised because hand completion
+   and coach analysis run on different coroutines.
 
 ## Testing notes
 
@@ -134,6 +139,10 @@ export JAVA_HOME="/Applications/Android Studio.app/Contents/jbr/Contents/Home"
   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.
+- Versioned player history survives process restarts in a small aggregate
+  `SharedPreferences` store. The setup screen restores the last player/coach
+  preference and shows cross-session agreement/review trends only after at least
+  ten coached decisions; smaller samples are labelled as insufficient.
 - 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.