feat: add normalized config tracking and improve command

- Add normalize_to_final_build() to map tune configs to final builds (323/233/332)
- Add normalized_config field to BestCarRecord
- Change CarCounts.by_rid key from String to (String, String) for per-config tracking
- Change CarCounts.guid_to_rid to HashMap<String, HashSet<(String, String)>>
- Extract owned tune configs from my_cars.json (engineMajor/weightMajor/chassisMajor)
- Add improve command: owned cars not yet at final build, sorted by track count
- Strip version prefixes (v2c_/v1c_) from config keys at parse time
- Update dedup check in update_best_car to consider normalized_config
- Add atomic_write helper for safe CSV output
- Delete completed plans/code-review-v2.md
- Apply rustfmt formatting across codebase

src/commands/track.rs

@@ -22,6 +22,6 @@ pub async fn run_track(
     rq: u8,
 ) -> Result<(), AppError> {
     let my_data = load_my_cars_or_warn(my_cars_path)?;
-    let (ctx, _counts) = run_analysis(&my_data.owned, cars_db_path, times_dir).await?;
+    let (ctx, _counts) = run_analysis(&my_data, cars_db_path, times_dir).await?;
     print_best_car(&ctx, track, condition, rq)
 }