Return the sorted list of trusted skill directory paths.
Path to the trust store file. Defaults to
~/.deepagents/.state/skill_trust.json.
When True, an existing-but-unreadable store re-raises instead
of degrading to an empty list. The audit command (skills trust list) passes strict=True so it can report an error rather than
falsely printing "No trusted skill directories" while entries the
user cannot then see or revoke sit in an unreadable file.
