fix!: standardize module directory naming to lowercase and update rel…

[roble]

This pull request refactors how module directory names are generated and stored, standardizing them to use lowercase slugs with hyphens preserved (e.g., something-nice instead of SomethingNice). It updates both the implementation in Installer.php and the corresponding tests to reflect this change.

Module naming and path generation changes:

• The default root directory for modules is now lowercase (modules instead of Modules).
• Module directory names are now generated as lowercase slugs, preserving hyphens, rather than being converted to PascalCase. For example, saucebase/something-nice becomes something-nice.
• Updated method documentation in Installer.php to clarify that module directory names are lowercase slugs.

Test updates:

• Updated tests in ModuleInstallerTest.php to expect lowercase module directory names and root directory (modules/something-nice instead of Modules/SomethingNice). [1] [2] [3]
• Added a new test to ensure getModuleName returns the expected lowercase slug for various package names.…ated tests

[Copilot]

Pull request overview

This PR standardizes module installation paths to use a lowercase root directory and lowercase slug-based module directory names (hyphens preserved), updating the installer behavior and aligning tests with the new paths.

Changes:

• Change default module root directory from Modules to modules.
• Update module directory naming from StudlyCase to lowercase slug (e.g., something-nice).
• Update install-path expectations in tests and add test coverage for getModuleName() slug behavior.

Reviewed changes

Copilot reviewed 2 out of 2 changed files in this pull request and generated 2 comments.

File	Description
src/Installer.php	Updates default root and module directory naming logic + related docblock text.
tests/ModuleInstallerTest.php	Updates install-path assertions and adds new test cases for slug-based module names.

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[Copilot]

Changing the default root/module directory naming (DEFAULT_ROOT and getModuleName) will change the install path for existing installations. During update(), stashModuleDir($this->getInstallPath($initial)) will now look in the new path, so previously-installed modules (e.g. Modules/StudlyCase) won’t be stashed/merged and Composer may also fail to uninstall the old path, leaving an orphaned directory. Consider adding a migration/legacy-path fallback (e.g., detect and stash/remove the legacy Modules/<StudlyCase> / <StudlyCase> location when it exists) and/or overriding uninstall() to clean up legacy paths.

[Copilot]

Some documentation is now inconsistent with the new lowercase install root and slug-based directory naming. In particular, the getBaseInstallationPath() doc comment in this file still says it defaults to Modules/, and the repo README/composer.json description also reference Modules/<StudlyCase> behavior. Please update those docs to match the new modules/<lowercase-slug> behavior so consumers aren’t misled.