devtools

afcbeedc - Add a skills for adding changelog entries and updating package versions (#9781)

Add a skills for adding changelog entries and updating package versions (#9781) * Add a skill for adding changelog entries to DevTools packages * Add skill for updating package versions that is used from the changelog skill * add exception for copyright requirement * address comments * Update .agents/skills/adding-changelog-entries/SKILL.md Co-authored-by: Jacob MacDonald <jakemac@google.com> * Update .agents/skills/adding-changelog-entries/SKILL.md Co-authored-by: Jacob MacDonald <jakemac@google.com> * whitespace --------- Co-authored-by: Jacob MacDonald <jakemac@google.com>