Validate Skills Hub lock-file install paths at both ends of the
lifecycle so a poisoned or malformed lock.json entry cannot drive
shutil.rmtree to a location outside SKILLS_DIR:
- HubLockFile.record_install rejects empty/'.'/absolute/traversal/
Windows-drive paths at write time, and requires the final path
component to match the skill name (shape: '<skill>' or
'<category>/<skill>').
- install_from_quarantine resolves its destination through the same
validator, catching symlink/junction redirects inside skills/.
- uninstall_skill resolves the lock entry through the new validator
before rmtree. Refuses anything that resolves to SKILLS_DIR itself
(empty/dot paths) or to a target outside SKILLS_DIR (absolute paths,
traversal, symlinked dirs in skills/ pointing outward).
- 14 focused regression tests covering each rejection class plus a
symlink-redirect case.
E2E verified: hand-crafted poisoned lock.json entries (absolute path,
empty install_path, traversal) all refuse and leave the targeted
victim untouched; legitimate uninstall still succeeds.
Co-authored-by: Teknium <127238744+teknium1@users.noreply.github.com>
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