chore(main): release 0.4.0

[github-actions]

🤖 I have created a release beep boop

0.4.0 (2026-08-30)

Features

• add configuration profiles (#26) (44ed0ca)
• add positional argument support (#19) (553a2f6), closes #15
• load extra CLI arguments from an environment variable (#21) (6f1ecba), closes #3
• read option/argument value type from attribute annotation (#23) (3085da3), closes #14
• rename the tool-name attribute from name to tool_name (#28) (d98c293)
• treat a callable option/argument default as a factory (#24) (787356b), closes #14
• validate Literal[...] annotations as choices (#25) (196464b), closes #22

Documentation

• add Copilot/AI contributor instructions (#16) (b517488)
• clarify option method return value is always final (#18) (6aa157a), closes #13

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[github-actions]

🤖 Created releases:

• v0.4.0

🌻