Clean up blank lines and orphaned comments in PATH config files

[shannah]

Summary

Improves the handling of PATH configuration files by cleaning up excessive blank lines and removing orphaned jDeploy installer comments during both add and remove operations.

Key Changes

• Add operation: Trims trailing whitespace before appending new PATH entries and uses a single blank line separator to prevent accumulation of blank lines
• Remove operation:
  • Detects and removes orphaned "Added by jDeploy installer" comments that aren't followed by the corresponding PATH export
  • Collapses multiple consecutive blank lines (3+) into at most one blank line
  • Trims trailing blank lines while preserving a single trailing newline
• Test coverage: Added 6 comprehensive test cases covering blank line cleanup, orphaned comment removal, and preservation of non-jDeploy content

Implementation Details

• The add operation now reads the current file content, trims trailing whitespace, and rewrites the entire file to ensure clean formatting
• The remove operation includes lookahead logic to identify orphaned comments and end-of-file comments
• Blank line normalization uses regex patterns to handle edge cases consistently
• All changes maintain backward compatibility and preserve non-jDeploy configuration entries

https://claude.ai/code/session_01D3Pey4PcNjGphHHbbADRdC