settings: Remove version fields (#33372)

This cleans up our settings to not include any `version` fields, as we
have an actual settings migrator now.

This PR removes `language_models > anthropic > version`,
`language_models > openai > version` and `agent > version`.

We had migration paths in the code for a long time, so in practice
almost everyone should be using the latest version of these settings.


Release Notes:

- Remove `version` fields in settings for `agent`, `language_models >
anthropic`, `language_models > openai`. Your settings will automatically
be migrated. If you're running into issues with this open an issue
[here](https://github.com/zed-industries/zed/issues)

crates/migrator/src/migrator.rs

@@ -152,6 +152,10 @@ pub fn migrate_settings(text: &str) -> Result<Option<String>> {
             migrations::m_2025_06_16::SETTINGS_PATTERNS,
             &SETTINGS_QUERY_2025_06_16,
         ),
+        (
+            migrations::m_2025_06_25::SETTINGS_PATTERNS,
+            &SETTINGS_QUERY_2025_06_25,
+        ),
     ];
     run_migrations(text, migrations)
 }
@@ -254,6 +258,10 @@ define_query!(
     SETTINGS_QUERY_2025_06_16,
     migrations::m_2025_06_16::SETTINGS_PATTERNS
 );
+define_query!(
+    SETTINGS_QUERY_2025_06_25,
+    migrations::m_2025_06_25::SETTINGS_PATTERNS
+);
 
 // custom query
 static EDIT_PREDICTION_SETTINGS_MIGRATION_QUERY: LazyLock<Query> = LazyLock::new(|| {
@@ -1052,4 +1060,75 @@ mod tests {
 }"#;
         assert_migrate_settings(settings, None);
     }
+
+    #[test]
+    fn test_remove_version_fields() {
+        assert_migrate_settings(
+            r#"{
+    "language_models": {
+        "anthropic": {
+            "version": "1",
+            "api_url": "https://api.anthropic.com"
+        },
+        "openai": {
+            "version": "1",
+            "api_url": "https://api.openai.com/v1"
+        }
+    },
+    "agent": {
+        "version": "2",
+        "enabled": true,
+        "preferred_completion_mode": "normal",
+        "button": true,
+        "dock": "right",
+        "default_width": 640,
+        "default_height": 320,
+        "default_model": {
+            "provider": "zed.dev",
+            "model": "claude-sonnet-4"
+        }
+    }
+}"#,
+            Some(
+                r#"{
+    "language_models": {
+        "anthropic": {
+            "api_url": "https://api.anthropic.com"
+        },
+        "openai": {
+            "api_url": "https://api.openai.com/v1"
+        }
+    },
+    "agent": {
+        "enabled": true,
+        "preferred_completion_mode": "normal",
+        "button": true,
+        "dock": "right",
+        "default_width": 640,
+        "default_height": 320,
+        "default_model": {
+            "provider": "zed.dev",
+            "model": "claude-sonnet-4"
+        }
+    }
+}"#,
+            ),
+        );
+
+        // Test that version fields in other contexts are not removed
+        assert_migrate_settings(
+            r#"{
+    "language_models": {
+        "other_provider": {
+            "version": "1",
+            "api_url": "https://api.example.com"
+        }
+    },
+    "other_section": {
+        "version": "1"
+    }
+}"#,
+            None,
+        );
+    }
 }