Capstone 09 — Code Migration Agent (Repo-Level Language / Runtime Upgrade)
Amazon's MigrationBench (Java 8 to 17) and Google's App Engine Py2-to-Py3 migrator set the 2026 bar. Moderne's OpenRewrite does deterministic AST rewrites at scale. Grit targets the same problem with codemod-style DSL. The production pattern combines both: a deterministic substrate for safe rewrites plus an agent layer for the ambiguous cases, a sandbox for per-branch builds, and a test harness that flips green before the PR opens. The capstone is to migrate 50 real repos and publish a pass rate with a failure taxonomy.
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It is part of the curriculum and will get the same treatment as Phase 1 — a visual cover, hands-on labs, derivations with numeric checks and a quiz. Until then, the original lesson is the best place to read it:
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