Private API

_clean_stale_cov_files!(source_dirs)

Internal helper that removes stale .cov files from source_dirs.

If multiple runs are detected (PID suffix in filenames), this function keeps the PID with the largest number of .cov files and removes the others.

_collect_and_move_cov_files!(source_dirs, dest_dir) -> Vector{String}

Internal helper that moves all .cov files from source_dirs into dest_dir.

Returns a vector of destination paths for the moved files.

_count_cov_files(source_dirs) -> Int

Internal helper that counts the number of .cov files in the provided directories.

_generate_coverage_reports!(source_dirs, coverage_dir, root_dir)

Internal helper that generates coverage reports from .cov files.

Writes:

• coverage/lcov.info
• coverage/cov_report.md

_reset_coverage_dir(coverage_dir, cov_storage_dir)

Internal helper that recreates the coverage/ directory structure.

This function removes coverage_dir (recursively) if it already exists, then creates cov_storage_dir.