feat: enhance lesson management and review system

- Added LessonAccept and LessonReject actions to manage lesson outcomes.
- Implemented probe for build/test verification before triggering reviews.
- Introduced a mechanism for recording shadow hits and evaluating trials in the ReviewSystem.
- Enhanced lesson structure with additional fields for scope, snippets, and provenances.
- Updated command parsing to include lesson acceptance and rejection commands.
- Improved session state management with staleness sweeps and retrospective creation.
- Enhanced UI to display detailed usage statistics and quality trends.

src/app/state/misc.rs

@@ -168,6 +168,7 @@ pub struct MiscState {
     pub security_armed: bool,
     pub security_acknowledged: bool,
     pub esc_press_count: u32,
+    pub last_staleness_sweep_ms: i64,
 }
 
 impl MiscState {
@@ -180,6 +181,7 @@ impl MiscState {
             security_armed: false,
             security_acknowledged: false,
             esc_press_count: 0,
+            last_staleness_sweep_ms: 0,
         }
     }