Follow symlinks for rules files

[mrubens]

Important

Enhance rule file processing to follow symbolic links, ensuring symlinked files are included, with updated tests for verification.

• Behavior:
  • readTextFilesFromDirectory in custom-instructions.ts now follows symbolic links to include symlinked files in rule processing.
  • Updates loadRuleFiles and addCustomInstructions to utilize the new symlink-following behavior.
• Tests:
  • Adds test in custom-instructions.test.ts to verify symlink handling in loadRuleFiles.
  • Updates existing tests to mock isSymbolicLink and readlink for symlink scenarios.

^{This description was created by for 6e1c2b3. It will automatically update as commits are pushed.}

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Latest commit: 6e1c2b3

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[ellipsis-dev]

Non-standard use of entry.parentPath in readTextFilesFromDirectory. Dirent objects from fs.readdir do not include this property by default. Consider documenting the custom use or calculating the full path via dirPath.