chore: release v0.3.0

[github-actions]

🤖 New release

• rustybam: 0.2.2 -> 0.3.0 (⚠ API breaking changes)

⚠ rustybam 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/v0.48.0/src/lints/enum_variant_added.ron

Failed in:
  variant Commands:SeqContent in /tmp/.tmps7BPO0/rustybam/src/cli.rs:283

Changelog

0.3.0 - 2026-08-16

Added

• add seq-content command and seq-stats improvements (#28)

Other

• use the default changelog template

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