ci: block coding-agent attribution in commits#2
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Agents sign commits with a Co-Authored-By trailer or by claiming the author field, and squash-merging folds those trailers into the merge commit, so one unnoticed line becomes permanent history. Adds a PR check covering the coding-agent identities that could be confirmed against real commits or vendor docs, plus a pass over the author and committer fields for agents that claim those instead. Dependabot and Renovate stay allowed: they are maintenance automation, not authorship claims.
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Coding agents sign their work with a
Co-Authored-Bytrailer or by claiming the author field, and squash-merging folds every commit's trailers into the merge commit, so one unnoticed line becomes permanent history.Adds a PR check covering the agent identities that could be confirmed against real public commits or vendor docs, plus a second pass over the author and committer fields for the agents that claim those instead of adding a trailer (Copilot's cloud agent, Jules, Devin). Dependabot and Renovate stay allowed, since they are maintenance automation rather than authorship claims.
Verified against real history: the pattern catches every known agent trailer while leaving human co-authors untouched.