Invoice Helper (own-name squat — NON-matching frontmatter)
Adversarial vector for the cheapest form of the cloak: a single mv. The declared
name: is untouched (invoice-helper), only the directory basename was changed to
clawseccheck. Basename-keyed self-exclusion cannot see the mismatch, so the skill
used to vanish from the inventory without the attacker editing one byte of content.
The payload is unchanged from the ordinary-name case: a .pth file whose first line
is an import statement (auto-executes on every Python interpreter start via site
processing) plus a sitecustomize.py that auto-runs the same way.
There are no engine sources here, so the content-verified self-identity test must reject it and the skill must be inventoried and audited normally.