Add --locale support to wp core multisite-install command docs and coverage

[Copilot]

wp core multisite-install did not expose --locale, even though install flow already accepts and applies locale via Core_Command::do_install(). This PR aligns multisite install with wp core install by surfacing locale in command docs/synopsis and acceptance coverage.

• Command interface/docs alignment

  • Added --locale=<locale> to core multisite-install command option docs in src/Core_Command.php.
  • Updated multisite-install assoc args phpdoc to include locale?: string.

• User-facing docs

  • Updated README.md multisite-install synopsis and options to include:
    • [--locale=<locale>]
    • description matching existing install semantics.

• Acceptance coverage

  • Updated existing Behat scenario for multisite install without explicit password to pass --locale=de_DE, ensuring the flag is accepted on multisite-install.

wp core multisite-install \
  --url=foobar.org \
  --title=Test \
  --admin_user=wpcli \
  --admin_email=admin@example.com \
  --locale=de_DE

Warning

Firewall rules blocked me from connecting to one or more addresses (expand for details)

I tried to connect to the following addresses, but was blocked by firewall rules:

• example.com
  • Triggering command: /usr/bin/php /usr/bin/php /home/REDACTED/work/core-command/core-command/vendor/wp-cli/wp-cli/bin/../php/boot-fs.php core install --url=REDACTED --title=WP CLI Site --admin_user=admin --admin_email=admin@example.com --admin_password=password1 --skip-email (dns block)
  • Triggering command: /usr/bin/php /usr/bin/php /home/REDACTED/work/core-command/core-command/vendor/wp-cli/wp-cli/bin/../php/boot-fs.php core update (dns block)
  • Triggering command: /usr/bin/php /usr/bin/php /home/REDACTED/work/core-command/core-command/vendor/wp-cli/wp-cli/bin/../php/boot-fs.php core install --url=example.com --title=Test --admin_user=wpcli --admin_email=wpcli@example.org --admin_password=password --skip-email (dns block)
• foobar.org
  • Triggering command: /usr/bin/php /usr/bin/php /home/REDACTED/work/core-command/core-command/vendor/wp-cli/wp-cli/bin/../php/boot-fs.php core multisite-install --url=foobar.org --title=Test --admin_user=wpcli --admin_email=admin@example.com HooksPath (dns block)
  • Triggering command: /usr/bin/php /usr/bin/php /home/REDACTED/work/core-command/core-command/vendor/wp-cli/wp-cli/bin/../php/boot-fs.php core multisite-install --url=foobar.org --title=Test --admin_user=wpcli --admin_email=admin@example.com --admin_password=password --skip-config (dns block)
  • Triggering command: /usr/bin/php /usr/bin/php /home/REDACTED/work/core-command/core-command/vendor/wp-cli/wp-cli/bin/../php/boot-fs.php core multisite-install --url=foobar.org --title=Test --admin_user=wpcli --admin_email=admin@example.com --admin_password=1 --strict (dns block)

If you need me to access, download, or install something from one of these locations, you can either:

• Configure Actions setup steps to set up my environment, which run before the firewall is enabled
• Add the appropriate URLs or hosts to the custom allowlist in this repository's Copilot coding agent settings (admins only)

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.

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[Copilot]

Pull request overview

This PR exposes the existing locale-aware install behavior to wp core multisite-install by adding --locale to the command’s documented options/synopsis and by extending the Behat coverage to ensure the flag is accepted.

Changes:

• Documented [--locale=<locale>] for wp core multisite-install in src/Core_Command.php (and updated the assoc-args phpdoc shape).
• Updated the generated user-facing docs in README.md to include --locale in synopsis/options.
• Updated the multisite-install acceptance scenario to invoke the command with --locale=de_DE.

Reviewed changes

Copilot reviewed 3 out of 3 changed files in this pull request and generated no comments.

File	Description
src/Core_Command.php	Adds --locale to multisite-install option docs and updates phpdoc assoc-args shape to include locale.
README.md	Updates the wp core multisite-install synopsis and options list to mention --locale.
features/core-install.feature	Extends the multisite-install scenario to pass --locale=de_DE, validating the flag is accepted.

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[swissspidy]

/gemini review

[gemini-code-assist]

Code Review

This pull request adds a --locale option to the wp core multisite-install command, updating the documentation, test suite, and PHPDoc. Feedback suggests correcting the command synopsis and PHPDoc type hints to accurately reflect that admin_user and base are optional parameters with default values.