* chore(addon): promote webhook-proxy dev -> stable 2.0.3

* chore(addon): stable 2.0.3 changelog entry; drop stale pending-promote allowlist wording

Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>

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Co-authored-by: github-actions[bot] <github-actions[bot]@users.noreply.github.com>
Co-authored-by: kingpanther13 <kingpanther13@users.noreply.github.com>
Co-authored-by: Claude Fable 5 <noreply@anthropic.com>