Add 5 skills from LFM + 12 skills total

New skills:
- blacknode-graph-workflow
- multi-agent-workflow-execution
- langgraph-agent-workflow
- langgraph-multi-agent-router
- three-tier-evaluation-pipeline

Config: LLM pipeline uses LFM on llama.cpp (8080)

skills/langgraph-agent-workflow/metadata.json

@@ -0,0 +1,36 @@
+{
+  "name": "langgraph-agent-workflow",
+  "version": "1.0.0",
+  "goal": "Orchestrate multi-step AI agents using LangGraph with SerperDevTool for RAG, code execution, and citation generation",
+  "inputs": [
+    "LangGraph chain configuration files defining agent workflows",
+    "SerperDevTool integration for LLM tool access",
+    "React agent creation scripts via create_react_agent",
+    "Knowledge graph retrieval and citation generation pipelines"
+  ],
+  "steps": [
+    "Step 1: Define LangGraph chain architecture with SerperDevTool integration - Create a LangGraph chain that combines retrieval, reasoning, and response generation using SerperDevTool for tool access",
+    "Step 2: Implement React agent wrapper - Use create_react_agent to build a frontend agent that can interact with the LangGraph chain",
+    "Step 3: Configure RAG pipeline - Set up vector search (Qdrant/OpenSearch) and knowledge graph retrieval (Neo4j/ArangoDB) with citation generation",
+    "Step 4: Add code execution sandbox - Integrate artifact generation capabilities for code-related tasks",
+    "Step 5: Orchestrate multi-step research workflow - Chain search \u2192 deep research \u2192 agent response in a single LangGraph workflow"
+  ],
+  "outputs": [
+    "Reusable LangGraph chain definition (pyfile) with configurable steps",
+    "React agent frontend component that can be deployed independently",
+    "RAG pipeline that generates block citations and grounded answers",
+    "Code execution sandbox for artifact generation",
+    "Documentation for parameterizing workflows for different tasks"
+  ],
+  "failure_modes": [
+    "GraphDB connection failures if Neo4j/ArangoDB is not properly configured",
+    "Vector store unavailability (Qdrant/OpenSearch) causing RAG pipeline to fail",
+    "LLM tool access errors if SerperDevTool is not properly initialized",
+    "Agent timeout if complex multi-step reasoning exceeds time limits",
+    "Sandbox execution failures if code has security vulnerabilities or infinite loops"
+  ],
+  "confidence": 0.95,
+  "explanation": "PipesHub provides a reusable LangGraph-based agent workflow framework that can be parameterized for different tasks. The core pattern involves defining a LangGraph chain with SerperDevTool integration for tool access, creating a React agent wrapper, and configuring RAG pipelines with citation generation. This framework can be reused across RAG, code execution, and research workflows by adjusting the chain definition and agent configuration.",
+  "source_repo": "https://github.com/pipeshub-ai/pipeshub-ai.git",
+  "score": 1.0
+}