Status: IN
Each of the 25 modules is independently runnable with only stdlib, no shared code, and in-process simulation of distributed behavior, making each a complete self-contained teaching artifact that can be understood in isolation.
Independence + stdlib-only + simulation compose into zero-dependency pedagogical units
Depends on (SL): sdi-repo-is-25-independent-modules, sdi-implementations-use-only-stdlib, sdi-implementations-are-in-process-simulations