ci: upgrade auto-merge with major version protection#11

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ANcpLua merged 3 commits intomainfrom

ci/upgrade-auto-merge

Jan 15, 2026

Commits on Jan 15, 2026

ci: add upgraded auto-merge workflow with major version protection
ANcpLua
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ci: remove old dependabot-auto-merge.yml (replaced by auto-merge.yml)
ANcpLua
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fix: apply CodeRabbit suggestions - remove unused trigger + add actor validation
ANcpLua
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