feat!: simplify agents-sdk API

BREAKING CHANGE:
- Unified OpenRouter provider (removed individual providers)
- Simplified tool.build() syntax
- New Agent constructor parameters
- Updated examples and documentation"

Author: ciro-maciel

src/agent.js

@@ -1,5 +1,5 @@
 /**
- * Representa o resultado de uma execução do agente.
+ * Represents the result of an agent execution.
  */
 class Output {
     #streamPromise;