Add Nodemailer raw message fixed references

[cookesan]

Adds Nodemailer raw message fixed references to GHSA-p6gq-j5cr-w38f.

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-p6gq-j5cr-w38f/GHSA-p6gq-j5cr-w38f.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]

Revalidated July 8, 2026: this remains scoped to Nodemailer v9.0.1 fixed evidence for GHSA-p6gq-j5cr-w38f. npm confirms nodemailer@9.0.1, and the upstream release tag resolves. Local merge-base checks pass with a single advisory JSON file changed, JSON parsing, git diff --check, and a clean worktree.