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docs/pre11-baseline.md

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+# Pre11 Baseline
+
+Pre11 was created as an exact snapshot copy of `repo-pre-10` before any
+Pre11 planning or implementation changes.
+
+## Source identity
+
+- Repository source commit: `c191517f3799291852f8673e90b0f1be8427d3a9`
+- `repo-pre-10` tree: `53d5c5fadc2d1fabf83346eadadec44c97c85c10`
+- `repo-pre-10/src` tree: `ec684d8dbd7662070234da1fe947aba48a293db8`
+
+## Destination identity before this document
+
+- `repo-pre-11` tree: `53d5c5fadc2d1fabf83346eadadec44c97c85c10`
+- `repo-pre-11/src` tree: `ec684d8dbd7662070234da1fe947aba48a293db8`
+
+## Exact copy verification
+
+Before this baseline document was added, `repo-pre-10` and `repo-pre-11`
+were verified identical by:
+
+- recursive byte-for-byte content comparison;
+- complete file and directory manifest comparison;
+- file type, mode, and symbolic-link target comparison;
+- identical complete subtree tree IDs;
+- identical `src` subtree tree IDs.
+
+The snapshot contains the same 307 tracked files as `repo-pre-10`. No nested
+Git repository, external untracked file, generated image, temporary artifact,
+or file larger than 10 MiB was introduced by the copy.
+
+## Pre11 state
+
+No implementation, build, configuration, or behavior change has occurred.
+This file only records the Pre11 snapshot baseline.