feat: add watch mode for automatic re-parsing on file changes

[treejamie]

Summary

• Add -w/--watch flag that monitors PDF files and automatically re-parses on changes
• Uses fswatch on macOS, inotifywait on Linux
• Docker image includes inotify-tools by default
• Shows timestamp on each parse for easy tracking

Usage

# Local (requires fswatch: brew install fswatch)
./parse -w resume.pdf

# Docker (works out of the box)
docker run --rm -v ~/Desktop:/data parsepdf -w resume.pdf

Test plan

• Run ./parse -w with a PDF and verify initial parse occurs
• Modify the PDF file and verify automatic re-parse triggers
• Test Docker watch mode with mounted volume
• Verify Ctrl+C cleanly stops the watcher

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