Add diagnosis playbook skills

mvp/architecture/current-mvp-architecture.md

@@ -48,6 +48,13 @@ flowchart TB
         AlertsTool["queryPrometheusAlerts"]
     end
 
+    subgraph Skills["Skill / Playbook"]
+        SkillRegistry["SkillRegistry"]
+        PlannerSkillHook["PlannerSkillMetadataHook"]
+        SkillsHook["SkillsAgentHook"]
+        ReadSkill["read_skill"]
+    end
+
     subgraph RAG["RAG Retrieval"]
         L0["KnowledgeIndexService"]
         VectorSearch["VectorSearchService"]
@@ -66,6 +73,11 @@ flowchart TB
     API --> App
     ChatService --> Agent
     AiOpsService --> Agent
+    SkillRegistry --> PlannerSkillHook
+    PlannerSkillHook --> Planner
+    SkillRegistry --> SkillsHook
+    SkillsHook --> Executor
+    Executor --> ReadSkill
     Agent --> Tools
     KnowledgeTool --> RAG
     RAG --> Store
@@ -101,6 +113,12 @@ Evidence Tools
   -> query_metrics
   -> queryPrometheusAlerts
 
+Skill / Playbook
+  -> SkillRegistry
+  -> PlannerSkillMetadataHook gives Planner name/description only
+  -> SkillsAgentHook gives Executor read_skill
+  -> Verifier is isolated from skills
+
 RAG Retrieval
   -> KnowledgeIndexService
   -> VectorSearchService