Resolve CODEOWNERS source paths relative to the repository root

[ho991217]

Problem

The job receives repository-relative source paths, but calculates each source directory with path.relative(rootDir, path.dirname(inputFile.path)). Node resolves the relative second argument against the process working directory. Running the CLI from a subdirectory therefore adds that subdirectory to generated patterns.

Reproduction

Create a repository with a .git directory, a pullup.config.ts using codeownersJob(), and a root CODEOWNERS file containing:

/docs/ @docs

From the repository's a/ subdirectory, run:

pullup sync

Actual generated rule:

/a/docs/ @docs

Expected behavior

The generated rule is /docs/ @docs regardless of the directory from which pullup is invoked.

Acceptance criteria

• Resolve each source path against the repository root before calculating its relative directory.
• Verify the output when invoked from the root and from a subdirectory.
• Cover an explicit --root whose value differs from the process working directory.