docs: update API reference and examples for declarative graph building and high-level API integration

Author: veithly

docs/core-concepts/agents.md

@@ -253,7 +253,7 @@ response = await agent.run("Get Bitcoin price and analyze trends")
 - **[Graph System](../core-concepts/graph-system.md)** - Advanced workflow orchestration
 - **[MCP Protocol](../core-concepts/mcp-protocol.md)** - Dynamic tool discovery and execution
 - **[API Reference](../api-reference/agents/base-agent.md)** - Complete agent API documentation
-**GitHub**: [View Source](https://github.com/XSpoonAi/spoon-ai/tree/main/spoon-cookbook/example/intent_graph_demo.py)
+**GitHub**: [View Source](https://github.com/XSpoonAi/spoon-core/blob/main/examples/intent_graph_demo.py)
 
 **What it demonstrates:**
 - Complete Graph agent implementation with intelligent routing
@@ -295,7 +295,7 @@ response = await agent.run("Get Bitcoin price and analyze trends")
 - Error handling in distributed systems
 
 #### 📊 [Graph Crypto Analysis](../examples/graph-crypto-analysis.md)
-**GitHub**: [View Source](https://github.com/XSpoonAi/spoon-ai/tree/main/spoon-cookbook/example/graph_crypto_analysis.py)
+**GitHub**: [View Source](https://github.com/XSpoonAi/spoon-core/blob/main/examples/graph_crypto_analysis.py)
 
 **What it demonstrates:**
 - Specialized cryptocurrency analysis agent