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docs/pre13-baseline.md

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+# Pre13 Baseline
+
+- Source commit: `35eb53c65a4f75ba580f64af043779b930e3bb78`
+- `repo-pre-12` tree: `4ea4d7cfbf8b8a884b291f7433e19ce8e5af5a11`
+- `repo-pre-12/src` tree: `d63c45c7872dcf9dd84007c8883cf9fbe0f9467d`
+- `repo-pre-13/src` tree after copy: `d63c45c7872dcf9dd84007c8883cf9fbe0f9467d`
+- Copy verification: 327 files, 43 directories, and 0 symbolic links matched by relative path, mode, link target, and SHA-256 content manifest before this document was added.
+- Copy manifest SHA-256: `c6bdcee893a45a03308897715062aada41c591a82432f2c0008dbd316d10cf07`
+
+Except for this baseline document, `repo-pre-13` is an exact copy of `repo-pre-12`.