chore: release v0.6.0

[sayanarijit]

🤖 New release

• settingspec: 0.5.1 -> 0.6.0 (⚠ API breaking changes)

⚠ settingspec breaking changes

--- failure enum_variant_added: enum variant added on exhaustive enum ---

Description:
A publicly-visible enum without #[non_exhaustive] has a new variant.
        ref: https://doc.rust-lang.org/cargo/reference/semver.html#enum-variant-new
       impl: https://github.com/obi1kenobi/cargo-semver-checks/tree/v0.50.0/src/lints/enum_variant_added.ron

Failed in:
  variant Commands:Clean in /tmp/.tmpyX8sjS/settingspec/src/cli.rs:62

Changelog

0.6.0 - 2026-09-27

Added

• (clean) add subcommand clean for easy cleanup

Other

• (readme) fix agebox doc

---

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