- Hand-rolled ZIP writer/reader (node:zlib only) with CRC verification,
UTF-8 names, store/deflate, path-traversal validation; verified
interoperable with system unzip
- .sfgz guide archives: export, copy-import (fresh ids, remapped
substeps), linked-import with explicit write-back save
- Advisory .lock-sfgz sidecar locks with stale detection and force-steal
- Snapshot backups with pruning and undoable restore
- 7 more workflow tests (19 total)
Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>