Modernize a COBOL estate to Azure, module by module, with agents you can govern.

Brazil's core banking, tax, and social systems run on COBOL that predates the people paid to maintain it, and the workforce that understands it is leaving 15% a year. This playbook is the operating manual for modernizing a mainframe estate with agentic AI: a portfolio strategy, a governed reference architecture, a seven-phase run sheet from assess to cutover, and a factory model that turns the first shipped module into predictable throughput, all on GitHub Copilot with the model picker, AI Credits, and agent mode.