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Add comprehensive documentation and workflow details for the ERT
test runner, including integration with Projectile projects for
automatic test discovery.
Refactor code to support focus/unfocus workflows, allowing
developers to efficiently manage test execution by focusing on
specific test files.
Introduce internal utility functions `cj/test--do-*` to modularize
logic for file operations and focus management, improving code
maintainability.
Add new tests in `test-test-runner.el` to validate the enhanced
functionality, ensuring robust handling of focus operations and test
execution scenarios.
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