fix: adjust executor listener value to avoid recursion

[greysonlalonde]

Note

Medium Risk
Touches core Flow execution by adding a per-method call cap that raises RecursionError, which could change behavior for unusually long-running/cyclic flows. Agent execution routing constants also changed, so any external code depending on the old trigger label may need updates.

Overview
Prevents runaway Flow executions caused by listeners that re-trigger themselves (e.g., a @listen label matching the method name) by adding a per-method call counter and configurable max_method_calls guard that raises RecursionError.

Updates AgentExecutor to route max-iteration handling via a new max_iterations_exceeded trigger (instead of force_final_answer) and passes a higher max_method_calls limit (max_iter * 10) when initializing its internal flow. Tests are updated and expanded to cover the new recursion guard and OR-condition self-listen behavior.

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