What does it take to modernize an 8-year-old codebase? Stacks (on stacks). 🥞

Shows how to sequence dependent agent sessions and stacked PRs across one repo rather than hoping a single prompt untangles a decade-old codebase — including where the one-shot attempt breaks.

• AI agent — An AI system that doesn't just answer once but works toward a goal in a loop — taking actions, reading the results, and deciding what to do next.

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