Release v2.0.0

Added

• Shell completions for bash, zsh, and fish (generated at build time)
• Man page generation at build time
• --no-fail flag to exit successfully even when no process is found
• SIGPIPE handling for clean pipe behavior (e.g., killport 8080 | head)
• PID deduplication on Linux and macOS (prevents duplicate kill attempts)
• IPv6 and UDP test coverage on macOS
• CHANGELOG.md

Changed

• Breaking: Exit code 2 when no matching process or container is found (was 0). Use --no-fail to restore previous behavior
• Updated Cargo.toml keywords for better discoverability
• Renamed Docker-specific types to generic container types (works with OrbStack, Podman, etc.)
• Container runtime detection: skip native processes when containers own the port (fixes OrbStack crash)

Fixed

• Duplicate process entries when a process listens on both IPv4 and IPv6
• Killing container runtime's port forwarder process (e.g., OrbStack Helper) instead of the container