Add agent context for how to run tests

[ecairol]

Summary by CodeRabbit

• Tests

  • Added PHPUnit test framework with scaffolding, including documentation for running full test suites, individual files, and specific test methods.

• Chores

  • Updated deployment configuration to exclude internal development files and documentation from production deployments.

[coderabbitai]

Caution

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📥 Commits

Reviewing files that changed from the base of the PR and between 7b9728b and 9637ec4.

📒 Files selected for processing (4)

• .agents/README.md
• .agents/skills/run-plugin-tests/SKILL.md
• .deployignore
• AGENTS.md

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Walkthrough

The pull request introduces PHPUnit test infrastructure to the project. A new tests/ directory with phpunit.xml configuration is added, along with a corresponding SKILL.md file documenting how to run tests. The composer scripts are updated to include a test command, and AGENTS.md is updated with a documented test workflow section. Additionally, .deployignore is modified to exclude the .agents directory, AGENTS.md, and CLAUDE.md files from deployment.

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_{Comment @coderabbitai help to get the list of available commands and usage tips.}