Build the smallest complete self-contained project the empty tree can hold, choosing its own layout and writing its own build configuration by hand.

Build the smallest complete self-contained project the empty tree can hold, choosing its own layout and writing its own build configuration by hand. Vendor nothing and use no submodules of any kind, since the verifier re-runs everything offline and a pointer it cannot fetch reads as a build failure rather than as the cause.

Deliver exactly two source files: one small pure library with a handful of total functions and no external imports, and one test file beside it that imports nothing outside the tree and asserts by reverting on failure. Declare the check command the verifier should run, and make sure it genuinely examines the test file rather than compiling nothing.

Keep the surface deliberately narrow: fewer functions and fewer files than seem natural, because the point of this job is to land cleanly within the node's build budget, not to demonstrate range.