chore: release 0.2.0

[bjcorder]

Release commit for v0.2.0.

Validation run locally:

• cargo fmt --check
• cargo check --workspace --locked
• cargo test -q
• cargo test --workspace --all-targets --locked
• cargo clippy --workspace --all-targets -- -D warnings

Merge with a merge commit only; do not squash or rebase so the release tag commit remains reachable from main.

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