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Add command-line argument parsing with clap: - -c/--config option to specify config file path - Overrides default search path when provided - Proper error handling for missing/invalid files Improve logging: - Peer connection log now uses separate log entries per field - Better readability with aligned timestamps Fix ICMPv6 error handling: - Add multicast destination filter to should_send_icmp_error() - Router Solicitation packets (ff02::2) now silently dropped - Add test case for multicast destination Add phase-based state machine design document: - Document pattern where lifecycle phases use distinct structs in enum - PeerSlot::Connecting(PeerConnection) -> PeerSlot::Active(ActivePeer) - Benefits: type safety, memory efficiency, security - Describes timeout handling and lookup table requirements