Update security email

[georg]

This now matches the security email in CODE_OF_CONDUCT.md.

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Note

Low Risk
Low risk documentation-only change; no code paths, security logic, or data handling are modified.

Overview
Updates SECURITY.md to direct vulnerability reports to security@entire.io (replacing report@entire.io), aligning the security contact email with the rest of the repo.

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[Copilot]

Pull request overview

Updates the security contact email in SECURITY.md to match the address referenced in CODE_OF_CONDUCT.md.

Changes:

• Replace report@entire.io with security@entire.io in the vulnerability reporting instructions.