Apply common scaffold files and configurations

.browserslistrc

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+> 1%
+last 1 Android versions
+last 1 ChromeAndroid versions
+last 2 Chrome versions
+last 2 Firefox versions
+last 2 Safari versions
+last 2 iOS versions
+last 2 Edge versions
+last 2 Opera versions

.eslintrc.js

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+module.exports = require('@happyprime/eslint-config');

.github/workflows/phpcs.yml

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+# Run PHP Code Sniffer (PHPCS) and comment on the pull request with any issues.
+#
+# This file is managed in https://github.com/happyprime/projects
+name: PHPCS (Default, PHP 8.3)
+
+on: pull_request
+
+# The GITHUB_TOKEN used by Dependabot has read-only permissions by default. We
+# provide write permissions to this workflow so that comments can be left on
+# the pull request.
+#
+# @see https://docs.github.com/en/code-security/dependabot/working-with-dependabot/automating-dependabot-with-github-actions#changing-github_token-permissions
+permissions:
+  contents: read
+  pull-requests: write
+
+jobs:
+  call-workflow:
+    uses: happyprime/workflows/.github/workflows/phpcs.yml@trunk
+    with:
+      php-version: '8.3'

.github/workflows/phpstan.yml

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+# Run PHPStan and comment on the pull request with any issues.
+#
+# This file is managed in https://github.com/happyprime/projects
+name: PHPStan (Default, PHP 8.3)
+
+on: pull_request
+
+# The GITHUB_TOKEN used by Dependabot has read-only permissions by default. We
+# provide write permissions to this workflow so that comments can be left on
+# the pull request.
+#
+# @see https://docs.github.com/en/code-security/dependabot/working-with-dependabot/automating-dependabot-with-github-actions#changing-github_token-permissions
+permissions:
+  contents: read
+  pull-requests: write
+
+jobs:
+  call-workflow:
+    uses: happyprime/workflows/.github/workflows/phpstan.yml@trunk
+    with:
+      php-version: '8.3'

.github/workflows/verify-build.yml

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+# This file is managed in https://github.com/happyprime/projects
+name: Verify build (Node 22)
+
+on: pull_request
+
+# The GITHUB_TOKEN used by Dependabot has read-only permissions by default. We
+# provide write permissions to this workflow so that comments can be left on
+# the pull request.
+#
+# @see https://docs.github.com/en/code-security/dependabot/working-with-dependabot/automating-dependabot-with-github-actions#changing-github_token-permissions
+permissions:
+  contents: read
+  pull-requests: write
+
+jobs:
+  call-workflow:
+    uses: happyprime/workflows/.github/workflows/verify-build.yml@trunk
+    with:
+      node-version: 22

.postcssrc.js

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+module.exports = require('@happyprime/postcss-config');

.prettierrc.js

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+module.exports = require('@happyprime/eslint-config/prettier');

.stylelintrc.js

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+module.exports = require('@happyprime/stylelint-config');

composer.json

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+{
+	"name": "happyprime/atvp.org",
+	"type": "project",
+	"minimum-stability": "stable",
+	"repositories": [
+		{
+			"type": "composer",
+			"url": "https://wpackagist.org"
+		}
+	],
+	"require-dev": {
+		"happyprime/coding-standards": "*",
+		"phpcompatibility/php-compatibility": "dev-develop as 9.99.99"
+	},
+	"scripts": {
+		"phpcs": "vendor/bin/phpcs",
+		"phpcbf": "vendor/bin/phpcbf",
+		"phpstan": "vendor/bin/phpstan analyse --memory-limit=2048M",
+		"lint": [
+			"@lint:theme",
+			"@lint:features"
+		],
+		"lint:theme": "phpcs --basepath=. ./themes/atvp.org -v",
+		"lint:features": "phpcs --basepath=. ./mu-plugins/atvp.org -v",
+		"fix": [
+			"@fix:theme",
+			"@fix:features"
+		],
+		"fix:theme": "phpcbf --basepath=. ./themes/atvp.org -v",
+		"fix:features": "phpcbf --basepath=. ./mu-plugins/atvp.org -v"
+	},
+	"config": {
+		"allow-plugins": {
+			"composer/installers": true,
+			"dealerdirect/phpcodesniffer-composer-installer": true,
+			"phpstan/extension-installer": true
+		},
+		"preferred-install": {
+			"happyprime/*": "source",
+			"*": "dist"
+		}
+	}
+}