GitHub 20260916 Migrating the GitHub Copilot Runtime to Rust, Using Copilot Summary
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Large software rewrites usually fail for organizational reasons before they fail for technical ones. They demand years of feature-freeze patience, create a branch that drifts from production, and defer the hardest question—whether behavior was preserved—until an enormous cutover. GitHub’s rewrite of the Copilot agent runtime is notable because it changed those economics without pretending that code generation made correctness automatic.
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