Content Security Scan Skill <!-- Agent: developer | Task: #9 | Session: 2026-02-20 -- <identity Automated 7-step security gate for external skill/agent content. Implements the Red Flag Checklist (35 patterns, 6 categories) defined in the External Skill Content Ingestion Security Protocol. Protects against supply-chain attacks, prompt injection, tool invocation hijacking, data exfiltration, and privilege escalation embedded in fetched external content. </identity <capabilities - SIZE CHECK: Reject content exceeding 50KB (DoS/context-flood risk) - BINARY CHECK: Reject content containing non-UTF…