Add phpcs.xml.dist to scaffolded packages

[Copilot]

Scaffolded packages now include a phpcs.xml.dist file for WordPress Coding Standards linting, matching the setup used across WP-CLI packages.

Changes

• templates/phpcs.xml.dist.mustache: Created a new Mustache template for phpcs.xml.dist with customizable prefix based on package name
• ScaffoldPackageCommand.php: Added logic to generate package_name_slug from package name and use the phpcs.xml.dist template during scaffolding
• scaffold-package.feature: Added test assertions verifying file creation, WP_CLI_CS ruleset presence, and customized prefix
• README.md: Updated to reflect new file in scaffolded output

The generated phpcs.xml.dist uses the WP_CLI_CS ruleset, which includes WordPress-Extra standards with WP-CLI-specific exclusions (e.g., allows short array syntax, excludes file naming conventions for PSR-4). The PrefixAllGlobals configuration is customized for each package - for example, wp-cli/foo gets prefix wpcli_foo, and wp-cli/export-command gets prefix wpcli_export_command.

Example

$ wp scaffold package wp-cli/my-command
Success: Created package files in ~/.wp-cli/packages/local/wp-cli/my-command

$ ls ~/.wp-cli/packages/local/wp-cli/my-command/
.gitignore  .editorconfig  .distignore  phpcs.xml.dist  composer.json  ...

$ cat ~/.wp-cli/packages/local/wp-cli/my-command/phpcs.xml.dist
# Shows customized prefix: wpcli_my_command

$ cd ~/.wp-cli/packages/local/wp-cli/my-command/
$ composer phpcs
# Now enforces WordPress Coding Standards via WP_CLI_CS ruleset

Original prompt

---

This section details on the original issue you should resolve

<issue_title>Add WordPress Coding Standards linting</issue_title>
<issue_description>A la wp-cli/wp-cli#3472</issue_description>

Comments on the Issue (you are @copilot in this section)

@danielbachhuber Related https://github.com/wp-cli/wp-cli/pull/4057

• Fixes Add WordPress Coding Standards linting #70

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