SKILL: Email Header Injection — Expert Attack Playbook AI LOAD INSTRUCTION : Expert email header injection and authentication bypass. Covers SMTP CRLF injection, SPF/DKIM/DMARC circumvention, display name spoofing, and mail client rendering abuse. Base models miss the nuance between header injection (technical) and email auth bypass (protocol-level) — this skill covers both attack surfaces. 0. RELATED ROUTING - crlf-injection — general CRLF injection; email headers are a specific high-value sink - ssrf-server-side-request-forgery — when SMTP server is reachable via SSRF (gopher://smtp) - open…