chore: bump version to 0.2.1

[mnriem]

Automated version bump to 0.2.1.

This PR was created by the Release Trigger workflow. The git tag v0.2.1 has already been pushed and the release artifacts are being built.

Merge this PR to record the version bump and changelog update on main.

[Copilot]

Pull request overview

Records the automated release bump to version 0.2.1 by updating project metadata and adding a corresponding changelog entry.

Changes:

• Bump pyproject.toml project version from 0.2.0 → 0.2.1
• Add a new 0.2.1 section to CHANGELOG.md

Reviewed changes

Copilot reviewed 2 out of 2 changed files in this pull request and generated 1 comment.

File	Description
pyproject.toml	Updates package version to 0.2.1 for the release.
CHANGELOG.md	Adds 0.2.1 release notes to document changes for the release.

Comments suppressed due to low confidence (2)

CHANGELOG.md:20

• This 0.2.1 section includes "feat(extensions): support .extensionignore... (#1781)", but the same change is still listed under "[Unreleased]" below. To avoid double-accounting, remove it from Unreleased (or ensure it only appears in one place).

- fix: use quiet checkout to avoid exception on git checkout (#1792)
- feat(extensions): support .extensionignore to exclude files during install (#1781)
- feat: add Codex support for extension command registration (#1767)

CHANGELOG.md:22

• The 0.2.1 entry appears to include changes that are already documented under 0.2.0 (and earlier), e.g. "chore: bump version to 0.2.0 (#1786)". For a 0.2.1 release, the changelog should usually list only changes since 0.2.0; consider regenerating this section from the v0.2.0..v0.2.1 range and removing duplicates.

- feat: add Codex support for extension command registration (#1767)
- chore: bump version to 0.2.0 (#1786)
- fix: sync agent list comments with actual supported agents (#1785)

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