Add hermes-agent Skills Guard fixed references

[cookesan]

Adds hermes-agent Skills Guard fixed references to GHSA-238w-f66p-w349.

Audit refresh, July 8, 2026:

• Confirmed the live PR is open, ready for review, merge-clean, and the visible advisory check is green.
• Rechecked the merge-base diff: exactly one advisory JSON file changes (advisories/github-reviewed/2026/05/GHSA-238w-f66p-w349/GHSA-238w-f66p-w349.json), JSON parses, git diff --check passes, and the exact-head worktree is clean.
• Revalidated the added public references and package-version evidence in the diff; all resolve through their source site or registry.

[cookesan]

Review note: this expands GHSA-238w-f66p-w349 with hermes-agent v2026.5.28 source tag and PyPI 0.15.0 package evidence while retaining the existing upstream fix and report references. I checked the PR head JSON against the OSV schema, confirmed commit 7ebebfbb8d10937cbf2219b4cf5e121b71e67428 resolves to the Skills Guard hardening change, confirmed the source tag URL resolves, and confirmed PyPI has hermes-agent==0.15.0; the affected PyPI range, CVSS scores, alias, and package metadata stay unchanged.