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## Why Git can interpret a requested commit SHA as a branch name when the remote's default branch has the same name. This can cause a marketplace plugin source to materialize a different commit than the one it pinned. ## What changed Resolve `HEAD` after checking out a SHA-pinned Git plugin source and reject the source when the resolved commit does not exactly match the requested SHA. Ref-name checkouts retain their existing behavior. ## Testing Add a regression test with a default branch named after another commit's SHA and verify that materialization rejects the mismatched checkout. GitOrigin-RevId: c19cbd98ee6167dad7b2ee72e283b3bd30b59713