test code v1

docs/pre9-manual-evidence/pre9-cache-final-kernel-cleanup.txt

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+Pre9 final decoded extent cache kernel and cleanup summary
+Date: 2026-08-13
+
+- Guest: FreeBSD 15.0-RELEASE-p8 amd64, QEMU TCG, 6144 MiB, 4 vCPUs.
+- KLD built with WITH_ZSTDIO=0 and loaded successfully.
+- No EROFS panic, assertion, mount error or decompression error appeared in
+  the captured dmesg tail.
+- Boot emitted pre-existing root-filesystem "bad dir ino" warnings before
+  the test KLD was loaded; these are not attributed to EROFS.
+- Explicit LZMA probe, LZMA full-read and LZ4 unmount/md detach operations
+  returned zero.
+- Test QEMU PID 812999 was terminated.
+- Host port 10030 was closed.
+- Test overlay was removed.
+- Guard QEMU PID 26318 remained alive.
+- Guard SSH port 9222 remained open.