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

tests/http_tests.rs

@@ -2,22 +2,17 @@
 
 use std::fs;
 
-use mockito::{Server, ServerGuard, Mock};
+use mockito::{Mock, Server, ServerGuard};
 use top_drives::get_file;
 
 /// Helper: create a mock that returns a successful response with the given body.
 fn mock_success(server: &mut ServerGuard, body: &str) -> Mock {
-    server.mock("GET", "/data.json")
-        .with_status(200)
-        .with_body(body)
-        .create()
+    server.mock("GET", "/data.json").with_status(200).with_body(body).create()
 }
 
 /// Helper: create a mock that returns the given HTTP status.
 fn mock_status(server: &mut ServerGuard, status: usize) -> Mock {
-    server.mock("GET", "/data.json")
-        .with_status(status)
-        .create()
+    server.mock("GET", "/data.json").with_status(status).create()
 }
 
 #[tokio::test]
@@ -39,7 +34,8 @@ async fn test_get_file_success() {
 async fn test_get_file_empty_response_retries_and_fails() {
     let mut server = Server::new_async().await;
     // Return 200 with empty body — triggers retry, then fails
-    let m = server.mock("GET", "/data.json")
+    let m = server
+        .mock("GET", "/data.json")
         .with_status(200)
         .with_body("")
         .expect(4) // 1 initial + 3 retries
@@ -58,10 +54,7 @@ async fn test_get_file_empty_response_retries_and_fails() {
 async fn test_get_file_server_error_retries() {
     let mut server = Server::new_async().await;
     // Return 500 three times, then 200
-    let m_fail = server.mock("GET", "/data.json")
-        .with_status(500)
-        .expect(3)
-        .create();
+    let m_fail = server.mock("GET", "/data.json").with_status(500).expect(3).create();
     let m_ok = mock_success(&mut server, "recovered");
 
     let dir = tempfile::tempdir().unwrap();
@@ -96,7 +89,8 @@ async fn test_get_file_client_error_fails_immediately() {
 async fn test_get_file_persistent_server_error_fails() {
     let mut server = Server::new_async().await;
     // 503 every time — should retry 3 times then fail
-    let m = server.mock("GET", "/data.json")
+    let m = server
+        .mock("GET", "/data.json")
         .with_status(503)
         .expect(4) // 1 initial + 3 retries
         .create();