refactor: update risk levels in tool definitions and validation logic to remove sensitive level

internal/ai/application/runtime/einoexperiment/react_test.go

@@ -65,7 +65,7 @@ func (e *fakeMCPToolExecutor) Execute(_ context.Context, toolCode string, argume
 	e.toolCode = toolCode
 	e.arguments = arguments
 	e.policy = policy
-	return aitooling.Definition{Code: toolCode, RiskLevel: aitooling.RiskLevelSensitive}, e.result, e.err
+	return aitooling.Definition{Code: toolCode, RiskLevel: aitooling.RiskLevelRead}, e.result, e.err
 }
 
 var _ model.ToolCallingChatModel = (*scriptedToolCallingModel)(nil)

internal/ai/tooling/registry.go

@@ -11,9 +11,8 @@ import (
 )
 
 const (
-	RiskLevelRead      = "read"
-	RiskLevelWrite     = "write"
-	RiskLevelSensitive = "sensitive"
+	RiskLevelRead  = "read"
+	RiskLevelWrite = "write"
 )
 
 // Definition is the normalized, engine-independent description of a tool.