test: add LLMTestWorkflow for testing LLM inference

- New workflow: LLMTestWorkflow
- Accepts prompt input (e.g., 'say hello')
- Calls LLMInferenceActivity to invoke local LLM
- Registers LLMInferenceActivity and LLMBatchInferenceActivity
- Returns LLM response text

Testing shows:
✅ Worker connects to Temporal successfully
✅ Activities register on startup
✅ Ready for LLM invocation tests

Usage:
  tctl workflow start --type LLMTestWorkflow \
    --task-queue poimen-taskqueue \
    --input '{"prompt":"say hello"}'

cmd/worker/main.go

@@ -53,6 +53,7 @@ func main() {
 	w.RegisterWorkflow(workflow.TestWorkflow)
 	w.RegisterWorkflow(workflow.RoutingWorkflow)
 	w.RegisterWorkflow(workflow.WorkflowGraphQuery)
+	w.RegisterWorkflow(workflow.LLMTestWorkflow)
 
 	// Register all activities
 	w.RegisterActivity(activity.CloneRepoActivity)
@@ -72,6 +73,8 @@ func main() {
 
 	// Routing workflow activities
 	w.RegisterActivity(activity.LLMRouterActivity)
+	w.RegisterActivity(activity.LLMInferenceActivity)
+	w.RegisterActivity(activity.LLMBatchInferenceActivity)
 	w.RegisterActivity(activity.ValidateWorkflowSpecActivity)
 	w.RegisterActivity(activity.ValidateCronWorkflowSpecActivity)
 

workflow/llm_test_workflow.go

@@ -0,0 +1,35 @@
+package workflow
+
+import (
+	"time"
+	"go.temporal.io/sdk/workflow"
+	"github.com/rockliang/poimen/workflows/activity"
+)
+
+// LLMTestWorkflowInput is the input for testing LLM activities
+type LLMTestWorkflowInput struct {
+	Prompt string `json:"prompt"`
+}
+
+// LLMTestWorkflow is a simple workflow to test LLM inference
+// Usage: tctl workflow start --type LLMTestWorkflow --task-queue poimen-taskqueue --input '{"prompt":"say hello"}'
+func LLMTestWorkflow(ctx workflow.Context, input LLMTestWorkflowInput) (string, error) {
+	// Call the LLM inference activity
+	opts := workflow.ActivityOptions{
+		StartToCloseTimeout: 60 * time.Second,
+	}
+	actCtx := workflow.WithActivityOptions(ctx, opts)
+
+	actInput := activity.LLMInferenceInput{
+		Model:      "reasoning",
+		UserPrompt: input.Prompt,
+	}
+
+	var result activity.LLMInferenceOutput
+	err := workflow.ExecuteActivity(actCtx, activity.LLMInferenceActivity, actInput).Get(actCtx, &result)
+	if err != nil {
+		return "", err
+	}
+
+	return result.Response, nil
+}