v1.15.6 - Fix 'Too many open files' error

Fixed

• invar map: File Handle Management (DX-82) - Fixed "Too many open files" error
  • Convert discover_python_files() generator to list to release directory handles immediately
  • Explicitly delete file list after processing to free memory
  • Prevents exhausting system file descriptor limit on large projects
  • Solves OSError on macOS and other systems with low default limits (typically 256 file descriptors)
  • Root cause: rglob() generator keeps directory handles open during iteration
  • Recommendation: Users can also increase system limits with ulimit -n 4096