docs: add car grip analysis feature, GripAnalysisView to README

README.md

@@ -59,6 +59,13 @@ Web-based sim racing telemetry analysis client. Connects to [rusty-telemetry](ht
 - Recommended shift RPM from aggregated data
 - Detailed shift event table
 
+### Car Grip Analysis
+- Grip envelope chart: peak lateral/accel/brake G vs speed (envelope extraction)
+- Grip circle scatter: longitudinal G vs lateral G (friction circle)
+- Cornering grip vs speed curve
+- Steering response: steer angle vs lateral G scatter
+- Summary stats: max lateral/accel/brake/combined G
+
 ### Car Characteristics
 - Aggregated shift-point profiles per car across all sessions
 - Expandable car cards showing per-gear RPM/speed ranges
@@ -143,7 +150,7 @@ racecraft/
 ├── src/
 │   ├── main.ts                 # App bootstrap (Vue + Pinia + Router)
 │   ├── App.vue                 # Root layout with navigation
-│   ├── router/index.ts         # 8 routes with lazy loading
+│   ├── router/index.ts         # 9 routes with lazy loading
 │   ├── types/index.ts          # TypeScript interfaces matching API JSON shapes
 │   ├── api/client.ts           # Typed Axios client (all API endpoints)
 │   ├── stores/
@@ -156,6 +163,7 @@ racecraft/
 │   │   ├── SessionsView.vue    # Session list with create/delete
 │   │   ├── SessionDetailView.vue # Run workflow, complete, analyze
 │   │   ├── ShiftPointsView.vue # RPM charts and shift event table
+│   │   ├── GripAnalysisView.vue # Grip envelope, grip circle, steering response
 │   │   ├── CharacteristicsView.vue # Car characteristics aggregation
 │   │   ├── TracksView.vue      # Track model list
 │   │   └── TrackDetailView.vue # Canvas track map renderer