chore: ignore git worktrees in lint, format and tests (#53)

Running lint, format:check or the tests from a checkout with worktrees under .worktrees/ also checked every other branch's copy of the code. Ignore .worktrees/ in eslint, prettier (via .gitignore and .prettierignore) and vitest.

Author: steve-calvert-glean

.gitignore

@@ -5,3 +5,4 @@ examples/basic/dist/
 coverage/
 .DS_Store
 EVAL-CHECKLIST.md
+.worktrees/

.prettierignore

@@ -1,5 +1,7 @@
 dist/
 node_modules/
+# Git worktrees for other branches; each one is checked in its own checkout.
+.worktrees/
 examples/glean/dist/
 examples/glean/plugins/
 examples/basic/dist/

eslint.config.js

@@ -6,6 +6,8 @@ export default tseslint.config(
     ignores: [
       "dist/**",
       "node_modules/**",
+      // Git worktrees for other branches; each one is linted in its own checkout.
+      ".worktrees/**",
       "examples/basic/dist/**",
       "examples/glean/dist/**",
       "examples/glean/plugins/**",

vitest.config.ts

@@ -1,7 +1,9 @@
-import { defineConfig } from "vitest/config";
+import { configDefaults, defineConfig } from "vitest/config";
 
 export default defineConfig({
   test: {
+    // Git worktrees for other branches hold their own copies of the tests.
+    exclude: [...configDefaults.exclude, ".worktrees/**"],
     // Many tests run real builds, validations and packed CLIs against temp
     // projects. They take 1-4s locally, and the shared CI runners run the
     // suite in parallel at a fraction of that speed, so vitest's 5s default