Add Enterprise Gateway UID validation fix commit

[cookesan]

Adds Enterprise Gateway UID validation fix commit to GHSA-chq7-94j8-cj28.

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/2026/06/GHSA-chq7-94j8-cj28/GHSA-chq7-94j8-cj28.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 Enterprise Gateway fix commit reference; it does not change affected ranges, package metadata, or severity.
• The added commit resolves to 562068d0c6c6c782e43d68c38b7640f4e4520030.
• The commit subject matches the advisory context: Enhance validation of UID and GUID against prohibited ids.

No other advisory fields are changed.