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docs/pre10-baseline.md

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+# Pre10 Baseline
+
+Pre10 was created as an exact tracked-tree snapshot of `repo-pre-9` before
+any Pre10 planning or source changes.
+
+## Source identity
+
+- Repository HEAD: `bedc8dae477ba0e82a4a7c4f0de7ccdd41696004`
+- `repo-pre-9` tree: `54b2845b80c33f05109af1fea84e962aca3a82d3`
+- `repo-pre-9/src` tree: `e657e8a63b097b061670f75ca01947a568ef33d5`
+
+## Copy verification
+
+Before this baseline file was added, `repo-pre-10` matched `repo-pre-9` in:
+
+- file and directory manifest;
+- byte-for-byte file contents;
+- file modes and timestamps;
+- complete subtree tree hash;
+- `src` subtree tree hash.
+
+The copied tree contained no nested `.git` directory, image, binary build
+artifact, temporary file, or file larger than 10 MiB.
+
+## Pre9 validation reference
+
+The final Pre9 manual QEMU smoke validation is recorded in
+[`pre9-cache-final-manual-validation.md`](pre9-cache-final-manual-validation.md).
+It reports successful KLD build/load and read-only mounts, correct LZMA
+single-read and full-file hashes, successful concurrent LZMA reads, a passing
+LZ4 regression read, and complete test resource cleanup.
+
+## Pre10 state
+
+No Pre10 source, build, configuration, or planning change has been made. This
+file only records the snapshot baseline.