👷 Add GitHub workflow for linting and code validation

[rickyheijnen]

🔍 Summary

This PR adds comprehensive GitHub Actions workflows for automated code quality checks including linting, static analysis, and validation across multiple file types and PHP versions.

📝 Description

• PHP CS Fixer integration with caching and artifact upload for failed runs
• PHPStan analysis across PHP 7.4-8.3 matrix and Psalm integration with conditional execution

💬 Additional information

The workflows are designed to run on every push and provide comprehensive code quality checks. The static analysis runs across multiple PHP versions to ensure compatibility, while the linting workflows validate various file formats commonly used in PHP projects.

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📥 Commits

Reviewing files that changed from the base of the PR and between efc3e23 and cd5587d.

📒 Files selected for processing (2)

• .github/workflows/code-lint.yml (1 hunks)
• .github/workflows/code-validate.yml (1 hunks)

\n\n## Walkthrough\nAdds two GitHub Actions workflows under .github/workflows: one to run PHP CS Fixer in dry-run mode on push with caching and failure artifacts, and another to run PHPStan static analysis across PHP 7.4–8.3 with caching, conditional config selection, and artifact upload on failure.\n\n## Changes\n| Cohort / File(s) | Summary of changes |\n| --- | --- |\n| CI workflows
\\.github/workflows/code-lint.yml, \\.github/workflows/code-validate.yml | Introduces Code Lint workflow (PHP 8.2, composer caching, PHP CS Fixer dry-run, cache artifact on failure) and Code Validate workflow (PHPStan matrix on PHP 7.4–8.3, composer and PHPStan cache, conditional config/paths, artifact upload on failure). |\n\n## Estimated code review effort\n🎯 2 (Simple) | ⏱️ ~10 minutes\n\n

\n\n## Pre-merge checks and finishing touches\n

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✅ Passed checks (3 passed)

\n\n| Check name | Status | Explanation |\n| :----------------: | :------- | :--------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- |\n| Title Check | ✅ Passed | The title succinctly describes the main change of adding GitHub Actions workflows for linting and code validation, directly matching the addition of the code-lint and code-validate pipelines in the diff. It is clear and specific, though it includes an emoji which is non-essential. |\n| Description Check | ✅ Passed | The description clearly outlines the addition of comprehensive GitHub Actions workflows for linting and static analysis across multiple PHP versions, which aligns with the PR’s implementation of PHP CS Fixer and PHPStan jobs. It directly relates to the changeset and provides relevant context for the workflows being introduced. |\n| Docstring Coverage | ✅ Passed | No functions found in the changes. Docstring coverage check skipped. |\n\n

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