initial agent setup

internal/llm/agent/agent.go

@@ -0,0 +1,17 @@
+package agent
+
+import (
+	"context"
+	"fmt"
+
+	"github.com/cloudwego/eino/flow/agent/react"
+)
+
+func GetAgent(ctx context.Context, name string) (*react.Agent, string, error) {
+	switch name {
+	case "coder":
+		agent, err := NewCoderAgent(ctx)
+		return agent, CoderSystemPrompt(), err
+	}
+	return nil, "", fmt.Errorf("agent %s not found", name)
+}