docs(changelog): regenerate for v0.9.0

[github-actions]

Regenerated from the history at v0.9.0 by .github/workflows/release-notes.yml.

Nothing was written by hand: rerun the workflow to refresh this branch.
Committing the changelog as part of the release instead — so the tag
covers it and this pull request is never opened — is what
.github/scripts/bump-version.sh does.

No checks will report here. A pull request opened with GITHUB_TOKEN
does not raise the pull_request event, so Rust does not run on it.

[coderabbitai]

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