feat(devops): add Oxfmt alongside Prettier for incremental migration

.oxfmtrc.json

@@ -0,0 +1,6 @@
+{
+  "$schema": "./node_modules/oxfmt/configuration_schema.json",
+  "printWidth": 80,
+  "sortImports": false,
+  "sortPackageJson": false
+}

CLAUDE.md

@@ -13,7 +13,8 @@ npm test                 # Run all tests (Vitest)
 npm run test:coverage    # Tests with coverage
 npm run lint             # ESLint
 npm run lint:fix         # ESLint with auto-fix
-npm run format           # Prettier
+npm run format           # Prettier (default formatter during Oxfmt migration)
+npm run format:oxfmt     # Oxfmt (opt-in incremental migration formatter)
 npm run build-prod       # Production build
 ```
 

CONTRIBUTING.md

@@ -68,12 +68,17 @@ git checkout -b fix/issue-number-bug-name
 
 ### Coding Standards
 
-We enforce code quality using ESLint and Prettier.
+We enforce code quality using ESLint and Prettier. Oxfmt is available during
+the incremental formatter migration, but it is not the default formatter yet.
 
 - **Format Code**:
   ```bash
   npm run format
   ```
+- **Format Code with Oxfmt**:
+  ```bash
+  npm run format:oxfmt
+  ```
 - **Lint Code**:
   ```bash
   npm run lint

map-generator/README.md

@@ -35,9 +35,9 @@ the [Official Openfront Wiki](https://openfront.wiki/Map_Making)
 
 6. Find the output folder at `../resources/maps/<map_name>`
 7. Go back to the root directory: `cd ..`
-8. Run Prettier: `npm run format`
+8. Run the default formatter: `npm run format`
    This rewrites ALL files in place. Git figures out which files are actually changed, don't worry.
-   Alternatively, you can either run Prettier per file: `npx prettier --write resources/maps/<map_name>/<file_name>` or in VSCode install the Prettier extension and per file do Show and run Commands > Format Document.
+   Alternatively, while the formatter migration is in progress, you can run Prettier per file: `npx prettier --write resources/maps/<map_name>/<file_name>` or in VSCode install the Prettier extension and per file do Show and run Commands > Format Document.
 
 ## Output Files