Fix newly reported PHPStan errors

[swissspidy]

Summary by CodeRabbit

• Bug Fixes
  • Improved download handling when version information or download URLs are provided in different formats.
  • Improved cleanup reliability when source or target version details are unavailable.
  • Reduced the likelihood of download and cleanup errors in edge cases.

[coderabbitai]

No actionable comments were generated in the recent review. 🎉

ℹ️ Recent review info

⚙️ Run configuration

Configuration used: defaults

Review profile: CHILL

Plan: Pro Plus

Run ID: ce540c22-5bdc-424d-8dde-22c86d5d70f4

📥 Commits

Reviewing files that changed from the base of the PR and between fe10efb and 5780138.

📒 Files selected for processing (1)

• src/Core_Command.php

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📝 Walkthrough

Walkthrough

Changes

Download type handling

Layer / File(s)	Summary
Download and cleanup type contracts src/Core_Command.php	The download flow casts the URL and requested version to strings. A static annotation documents download offer fields. cleanup_extra_files() documents nullable source and target versions.

Estimated code review effort: 1 (Trivial) | ~5 minutes

Suggested reviewers: copilot

🚥 Pre-merge checks | ✅ 5

✅ Passed checks (5 passed)

Check name	Status	Explanation
Description Check	✅ Passed	Check skipped - CodeRabbit’s high-level summary is enabled.
Title check	✅ Passed	The title clearly describes the changes, which add type casts and documentation updates to resolve PHPStan errors.
Docstring Coverage	✅ Passed	No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check.
Linked Issues check	✅ Passed	Check skipped because no linked issues were found for this pull request.
Out of Scope Changes check	✅ Passed	Check skipped because no linked issues were found for this pull request.

✨ Finishing Touches 💡 1

🛠️ Fix failing CI checks 💡

• Create stacked PR
• Commit on current branch

📝 Generate docstrings

• Create stacked PR
• Commit on current branch

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch fix/phpstan

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[Copilot]

Pull request overview

This PR updates the Core_Command implementation to resolve newly reported PHPStan type issues, primarily by making variable types explicit where WP-CLI input parsing and API responses can be nullable or mixed.

Changes:

• Casts array_shift( $args ) and $assoc_args['version'] to string to satisfy static analysis expectations.
• Adds an explicit array-shape assertion for the $offer returned from WordPress.org APIs before indexing.
• Updates cleanup_extra_files() PHPDoc to reflect that version parameters may be null.

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[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.

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