docs: update documentation for normalized config and improve command

- Add improve command to all command tables and usage sections
- Add normalized_config field to BestCarRecord struct documentation
- Update CarCounts.by_rid type from String to (String, String)
- Update CarCounts.guid_to_rid type to HashMap<String, HashSet<(String, String)>>
- Add owned_configs field to MyCarsData and CarCounts docs
- Add normalize_to_final_build() to API docs
- Update CSV format examples to include FinalBuild column
- Update my_cars.json structure with engineMajor/weightMajor/chassisMajor
- Update timing file example with v2c_ version prefix
- Add version prefix stripping to data transformation docs
- Update CHANGELOG.md with Unreleased section
- Fix compare_records description to include normalized config sorting

docs/DATA_STRUCTURES.md

@@ -56,11 +56,17 @@ This document describes the JSON data structures used by the Top Drives Records
   "playerDeck": [
     {
       "cardId": "card_ferrari_f40_1987",
-      "locked": true
+      "locked": true,
+      "engineMajor": 3,
+      "weightMajor": 2,
+      "chassisMajor": 3
     },
     {
       "cardId": "card_mclaren_f1_1993",
-      "locked": false
+      "locked": false,
+      "engineMajor": 2,
+      "weightMajor": 3,
+      "chassisMajor": 3
     }
   ]
 }
@@ -73,11 +79,16 @@ This document describes the JSON data structures used by the Top Drives Records
 | `playerDeck` | Array | List of user's cards |
 | `cardId` | String | Unique card identifier |
 | `locked` | Boolean | Whether card is owned (true = owned) |
+| `engineMajor` | Number | Engine tune level (optional) |
+| `weightMajor` | Number | Weight tune level (optional) |
+| `chassisMajor` | Number | Chassis tune level (optional) |
 
 **Processing Logic**:
 - Only `locked: true` cards are considered owned
 - `cardId` values are matched against car database GUIDs
 - Used to mark cars as "owned" in analysis results
+- Tune config extracted as `"{engineMajor}{weightMajor}{chassisMajor}"` (e.g., `"323"`)
+- Cards with incomplete tune data are skipped for the improve command with a warning
 
 ### 3. Individual Car Timing Files (`times/{rid}.json`)
 
@@ -90,7 +101,7 @@ This document describes the JSON data structures used by the Top Drives Records
 {
   "users": ["Player1", "Player2"],
   "data": {
-    "111": {
+    "v2c_111": {
       "times": {
         "laguna_a00": {
           "t": 112.45,
@@ -246,7 +257,12 @@ let cars: Vec<Car> = serde_json::from_str(&content)?;
 // Parse individual car timing file
 let json_data: Value = serde_json::from_str(&file_content)?;
 if let Some(configurations) = json_data["data"].as_object() {
-    for (config, entry) in configurations {
+    for (raw_config, entry) in configurations {
+        // Strip version prefix (e.g., "v2c_" from "v2c_233")
+        let config = raw_config
+            .strip_prefix("v2c_")
+            .or_else(|| raw_config.strip_prefix("v1c_"))
+            .unwrap_or(raw_config);
         if let Some(times) = entry["times"].as_object() {
             for (track_id, details) in times {
                 // Process each track time
@@ -290,8 +306,10 @@ BestCarRecord {
     year: car.year,
     rq: car.rq,
     config: config.clone(),
+    normalized_config: normalize_to_final_build(&config),
     time,
     owned: my_cars.contains(&car.guid),
+    prize: car.prize,
     guid: car.guid.clone(),
 }
 ```