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Added
VirusTotal hash lookup scanning — optional SHA-256 hash check against the VirusTotal API. Files that pass GuardDuty are checked against VT; those with detections at or above virustotal_threshold are quarantined. API key stored as SSM SecureString.
File processing audit trail — optional DynamoDB table records every file at each pipeline stage (received, GuardDuty, VirusTotal, prompt injection, routed) with configurable TTL retention via audit_trail_retention_days.
Egress notifications — optional SNS topic fires when clean files reach the egress bucket, enabling downstream automation.
CloudWatch dashboard metric filters — expanded dashboard with VirusTotal scan metrics, prompt injection metrics, and egress notification tracking.