Keep the license notice of SECURITY.md beside it

The security policy is read by people who report a flaw; its notice is for
tools. Codacy found the notice's acronyms undefined and the address in its
copyright line taken for personal data. The notice moves, unchanged, into
SECURITY.md.license, the sidecar file REUSE defines for this; the policy
starts with its title, and its reporting address stays where it was.
LICENSES/README.md says where the notice is.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01Ji7xZMYjc4zankoc7hGBE1

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