Add Security scan for AI agent skills (#47) #67

Job	Run time
Validate plugin manifests	9s
Discover skills	6s
Validate skill (magpie)	7s
Validate skill (rocm-doctor)	7s
Validate skill (local-ai-use)	7s
Validate skill (local-ai-app-integration)	11s
Validate skill (apu-memory-tuner)	10s
Validate skills and plugin manifests	2s
	59s

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