Path.rglob does not descend symlinks, so a symlinked external plugin
(the ADR-003 dev loop) silently escaped the contract-purity scan. The
scanner now resolves plugin dirs before walking, a regression test
plants a symlinked plugin with a real violation and asserts it is
flagged, and the known-limitation notes in the external-repo docs are
lifted.
Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>
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