v0.2.0

• BREAKING: File output now exports to PCAP format instead of raw binary
  ** Generated pcap files include proper Ethernet/IP/UDP headers
  ** Files can be analyzed with Wireshark, tcpdump, and other pcap tools
  ** Destination IP/port from --dest argument is used in pcap headers
• Safety: Complete rewrite of all type conversions and arithmetic to use safe operations
  ** Replaced all as casts with try_from() with proper error handling
  ** Replaced all arithmetic (+, -, *, /) with checked operations (checked_add(), etc.)
  ** Prevents silent overflow, truncation, and potential panics
  ** Added comprehensive error messages for invalid packet sizes and overflows
• Dependencies: Added pcap-file v2.0 for pcap file generation
• Quality: Zero clippy warnings, all tests passing