Lucas Berger
690f0b95c0
src/lib/rank.test.ts was the last co-located API test. The API tsconfig excludes tests/ from the build, so all test files belong there; a test in src/ gets compiled into dist/ and vitest then runs the stale compiled copy (the source of phantom '22 todo' and dist sourcemap warnings). Moving it to tests/lib/ matches convention and leaves zero test files in src/, so the production build no longer emits test artifacts. Updated rank.test.ts path refs in phase-04 plan docs.
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