Complete folder sync implementation: exclude patterns and duplicate command fix

[Copilot]

The folder sync feature had unfinished work: exclude patterns (--exclude) were saved to config but never used, and statusCmd was registered twice causing duplicate help entries.

Changes

Exclude pattern implementation

• Added DetectDriftWithExcludes() to filter files during drift detection
• Updated all folder operations to pass exclude patterns: track, status, sync, import, apply
• Patterns match against both base filename and full relative path via filepath.Match

# Now works as expected
conf track ~/scripts --name scripts --exclude "*.tmp" --exclude ".DS_Store"
conf status scripts  # *.tmp and .DS_Store files excluded from drift detection

Bug fixes

• Removed duplicate statusCmd registration from root.go (already registered in status.go init)
• Fixed grammar: "1 file with drift" vs "2 files with drift"

Tests

• Added drift_test.go: drift detection, exclude patterns, summary formatting
• Added sync_test.go: ImportFile, ApplyFile, DeleteFile, ImportAll, ApplyAll

Original prompt

finish any unfinished work in the folder sync implementation

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