Add BoxLite fix commit reference

[cookesan]

Adds BoxLite fix commit reference to GHSA-g6ww-w5j2-r7x3.

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-g6ww-w5j2-r7x3/GHSA-g6ww-w5j2-r7x3.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]

Rechecked this reference-only PR while keeping the open Advisory Database queue current.

• The patch only adds the BoxLite fix commit reference; it does not change affected ranges, package metadata, or severity.
• The added commit resolves to 2c26968ec523d171b5496d74da434199e8b1fb1b.
• The commit subject matches the advisory context: fix(security): enforce read-only virtiofs at hypervisor level (#454).

No other advisory fields are changed.