pkg/aflow: add ability to generate several candidate replies for LLM agents

Add LLMAgent.Candidates parameter.
If set to a value N>1, then the agent is invoked N times,
and all outputs become slices.

The results can be later aggregated by another agent,
as shown in the test.

1 files changed, 11 insertions, 0 deletions

diff --git a/pkg/aflow/template_test.go b/pkg/aflow/template_test.go
index e42ddd2c3..3b24d62f6 100644
--- a/pkg/aflow/template_test.go
+++ b/pkg/aflow/template_test.go
@@ -44,6 +44,17 @@ func TestTemplate(t *testing.T) {
 		},
 		{
 			template: `
+				{{range $i, $v := .array}}
+					{{$i}} {{$v}}
+				{{end}}
+				`,
+			vars: map[string]reflect.Type{
+				"array": reflect.TypeFor[[]int](),
+			},
+			used: []string{"array"},
+		},
+		{
+			template: `
 				{{if .bar}}
 					{{.foo}}
 				{{end}}