Exclude node_modules from babel template recompilation, fix Netlify

- Add exclude pattern to babel plugin to prevent recompiling pre-built
  v2 addon dist files (only ember-source is included for macros)
- Use @warp-drive/build-config setConfig() for proper WarpDrive macros
- Copy Netlify _headers/_redirects to public/ directory
- ember-styleguide v2 blocked: its dist uses @ember/template-compiler
  which requires ember-source 6.x (not available on 5.12)

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

Author: NullVoxPopuli

app/app.js

@@ -1,9 +1,6 @@
 import Application from 'ember-strict-application-resolver';
 import PageTitleService from 'ember-page-title/services/page-title';
 
-// TODO: Re-add once ember-styleguide v2 conversion is complete
-// import * as NavbarService from 'ember-styleguide/services/navbar';
-
 import Router from './router.js';
 
 export default class App extends Application {

app/controllers/application.js

@@ -1,6 +1,7 @@
 import Controller from '@ember/controller';
 
-// TODO: Restore once ember-styleguide v2 conversion is complete
+// TODO: Restore once ember-styleguide v2 conversion targets ember-source 5.12
+// The v2 addon dist uses @ember/template-compiler which requires ember-source 6.x+
 // import { infoLinks } from 'ember-styleguide/constants/es-footer';
 // import headerLinks from 'ember-styleguide/constants/links';
 // import replaceLinks from 'ember-website/utils/replace-links';

app/templates/application.hbs

@@ -9,7 +9,7 @@
     </LinkTo>
   </CalloutBanner>
 
-{{!-- TODO: Restore EsHeader/EsFooter once ember-styleguide v2 conversion is complete --}}
+{{!-- TODO: Restore EsHeader/EsFooter once ember-styleguide v2 is compatible with ember-source 5.12 --}}
 
 <main>
   {{outlet}}

pnpm-lock.yaml

@@ -55,6 +55,8 @@ export default defineConfig({
       babelHelpers: 'runtime',
       extensions,
       configFile: './babel.config.mjs',
+      // Don't recompile templates in pre-built v2 addon dist files
+      exclude: /node_modules\/(?!ember-source\/)/,
     }),
   ],
 });