test code v1

tests/TC105-zstd-level1.md

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+# Test Case: zstd Compression Level 1
+
+**Test ID**: TC105-zstd-level1  
+
+**G5 fixture contract**: Use [G5-MANUAL-SETUP.md](G5-MANUAL-SETUP.md).
+Its generated paths, source comparisons, structured corruption offsets, and
+cleanup rules supersede placeholder examples in this file.
+**Category**: Compression  
+**Priority**: High  
+**Regression**: None
+
+## Objective
+Verify zstd compressed data path with level 1 (fastest) compression.
+
+## Preconditions
+- EROFS image created with zstd level 1: `mkfs.erofs -zzstd,level=1 test.img src/`
+- Test files of various sizes
+- FreeBSD 13.0+ with libzstd
+
+## Test Steps
+1. Create image with zstd level 1 compression
+2. Attach and mount: `unit=$(mdconfig -a -t vnode -f test.img); mount -t erofs -o ro /dev/${unit} /mnt`
+3. Read files and verify content
+4. Test random access patterns
+5. Measure throughput
+
+## Expected Results
+- All files decompress correctly
+- Fast decompression speed
+- Good compression ratio even at level 1
+- Random access works correctly
+
+## Verification Method
+- SHA256 checksums match originals
+- Decompression throughput > 200 MB/s
+- No zstd decompression errors
+- Random reads succeed
+
+## Cleanup
+```sh
+umount /mnt
+mdconfig -d -u "${unit}"
+```
+
+## Notes
+Tests feature 59: zstd compressed data path with fast compression.