LN-Videos-Observability-Testing VID-OBS-001-Construyendo-IA-Fiable-Evals-Trazabilidad-y VID-OBS-002-Curso-evaluacion-LLM-con-Promptfoo—episodio VID-OBS-003-AI-Testing-Series-Day-2—Variable-Injection VID-OBS-004-Introduction-to-Observability-and-Prometheus VID-OBS-005-E124—Creando-agentes-con-PydanticAI