Add vendor assessment agent

Signed-off-by: Aurélien Sibiril <81782+aureliensibiril@users.noreply.github.com>

pkg/probod/llm.go

@@ -26,6 +26,28 @@ import (
 	llmopenai "go.probo.inc/probo/pkg/llm/openai"
 )
 
+// resolveAgentClient resolves the agent's effective config from defaults and
+// builds an LLM client for it. The name parameter is used in the logger and
+// in error messages.
+func (impl *Implm) resolveAgentClient(
+	name string,
+	agent LLMAgentConfig,
+	l *log.Logger,
+	tp trace.TracerProvider,
+	r prometheus.Registerer,
+) (LLMAgentConfig, *llm.Client, error) {
+	resolved := impl.cfg.Agents.ResolveAgent(agent)
+	providerCfg, ok := impl.cfg.Agents.Providers[resolved.Provider]
+	if !ok {
+		return LLMAgentConfig{}, nil, fmt.Errorf("unknown LLM provider %q for %s agent", resolved.Provider, name)
+	}
+	client, err := buildLLMClient(providerCfg, l.Named("llm."+name), tp, r)
+	if err != nil {
+		return LLMAgentConfig{}, nil, fmt.Errorf("cannot create %s LLM client: %w", name, err)
+	}
+	return resolved, client, nil
+}
+
 func buildLLMClient(cfg LLMProviderConfig, l *log.Logger, tp trace.TracerProvider, r prometheus.Registerer) (*llm.Client, error) {
 	providerType := cfg.Type
 	if providerType == "" {