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docs: update AGENTS.md with test262, changeset, and bugfix workflow guidance (#20659)

- Add test262-cases to test directories and test commands table
- Clarify changeset descriptions should not use fix:/feat: prefix
- Add test-first workflow note for bug fixes

Co-authored-by: Claude Opus 4.6 (1M context) <noreply@anthropic.com>
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Committed by GitHub <noreply@github.com> on 3/17/2026, 5:18:24 PM