Automatically migrate to v2 schema on load

README.md

@@ -431,18 +431,3 @@ Options:
   --verbose       Show verbose output.
   -?, -h, --help  Show help and usage information
 ```
-
-#### `stack config migrate` <!-- omit from toc -->
-
-Migrate the configuration file from v1 to v2 format.
-
-```shell
-Usage:
-  stack config migrate [options]
-
-Options:
-  --working-dir   The path to the directory containing the git repository. Defaults to the current directory.
-  --verbose       Show verbose output.
-  -y, --yes       Confirm the command without prompting.
-  -?, -h, --help  Show help and usage information
-```

src/Stack.Tests/Config/FileStackConfigTests.cs

@@ -27,7 +27,7 @@ public void Load_WhenConfigFileDoesNotExist_ReturnsEmptyList()
     }
 
     [Fact]
-    public void Load_WhenConfigFileIsInV1Format_LoadsCorrectly()
+    public void Load_WhenConfigFileIsInV1Format_LoadsCorrectly_MigratesAndSavesFileInV2Format()
     {
         // Arrange
         using var tempDirectory = TemporaryDirectory.Create();
@@ -67,7 +67,41 @@ public void Load_WhenConfigFileIsInV1Format_LoadsCorrectly()
         var stackData = fileStackConfig.Load();
 
         // Assert
-        stackData.Should().BeEquivalentTo(new StackData(SchemaVersion.V1, [expectedStack]));
+        stackData.Should().BeEquivalentTo(new StackData(SchemaVersion.V2, [expectedStack]));
+        var savedJson = File.ReadAllText(configPath);
+        var expectedJson = $@"{{
+    ""SchemaVersion"": 2,
+    ""Stacks"": [
+        {{
+            ""Name"": ""{stackName}"",
+            ""RemoteUri"": ""{remoteUri}"",
+            ""SourceBranch"": ""{sourceBranch}"",
+            ""Branches"": [
+                {{
+                    ""Name"": ""{branch1}"",
+                    ""Children"": [
+                        {{
+                            ""Name"": ""{branch2}"",
+                            ""Children"": []
+                        }}
+                    ]
+                }}
+            ]
+        }}
+    ]
+}}";
+
+        // Normalize both JSON strings to remove whitespace differences
+        var normalizedSavedJson = NormalizeJsonString(savedJson);
+        var normalizedExpectedJson = NormalizeJsonString(expectedJson);
+
+        normalizedSavedJson.Should().Be(normalizedExpectedJson);
+
+        // Original backup should be in V1 format
+        var backupPath = fileStackConfig.GetV1ConfigBackupFilePath();
+        File.Exists(backupPath).Should().BeTrue();
+        var backupJson = File.ReadAllText(backupPath);
+        backupJson.Should().Be(v1Json);
     }
 
     [Fact]

src/Stack/Commands/Config/ConfigCommand.cs

@@ -4,7 +4,6 @@ public class ConfigCommand : GroupCommand
 {
     public ConfigCommand() : base("config", "Manage stack configuration.")
     {
-        Add(new MigrateConfigCommand());
         Add(new OpenConfigCommand());
     }
 }

src/Stack/Config/StackConfig.cs

@@ -44,8 +44,11 @@ public StackData Load()
             return new StackData(SchemaVersion.V2, LoadStacksFromV2Format(jsonString));
         }
 
-        // If no schema version, this means v1 format, which we need to convert to v2.
-        return new StackData(SchemaVersion.V1, LoadStacksFromV1Format(jsonString));
+        // If no schema version, this means v1 format - migrate to v2 format and re-save before returning
+        var stacksV1 = LoadStacksFromV1Format(jsonString);
+        var stacks = new StackData(SchemaVersion.V2, stacksV1);
+        Save(stacks);
+        return stacks;
     }
 
     public void Save(StackData stackData)