Make SkillSpector advisory + only scan changed skills #120

Job	Run time
Validate plugin manifests	7s
Discover skills	10s
Validate skill (magpie)	9s
Validate skill (apu-memory-tuner)	6s
Validate skill (rocm-doctor)	8s
Validate skill (local-ai-use)	10s
Validate skill (serving-llms-on-instinct)	7s
Validate skill (local-ai-app-integration)	7s
Validate skills and plugin manifests	3s
	1m 7s

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