Summary

Adds a --version option to the envsense CLI that displays the current version of the tool.

Changes

• Added version support: Modified the clap #[command] attribute in src/main.rs to include version = env!("CARGO_PKG_VERSION")
• Comprehensive testing: Added two new tests in tests/cli.rs:
  • version_flag_displays_version() - tests --version
  • version_short_flag_displays_version() - tests -V

Key Features

• Automatic version detection: Uses env!("CARGO_PKG_VERSION") to pull version from Cargo.toml
• Standard CLI behavior: Supports both --version and -V flags (clap default)
• Proper output format: Displays envsense X.Y.Z format
• No breaking changes: All existing CLI functionality remains intact

Testing

# Test the new functionality
cargo run -- --version
cargo run -- -V

# Run the test suite
cargo test --test cli

Example Output

$ envsense --version
envsense 0.2.2

$ envsense --help
Environment awareness utilities

Usage: envsense [OPTIONS] [COMMAND]

Commands:
  info   Show what envsense knows
  check  Evaluate predicates against the environment
  help   Print this message or the help of the given subcommand(s)

Options:
      --no-color  Disable color
  -h, --help      Print help
  -V, --version   Print version

This implements a standard CLI version option following Rust/clap best practices.