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6 functions, 53 lines. highway.js 4,158 -> 4,105. NOT ONE CALL SITE CHANGES. project, roundRect, bnvNormalizedPoints, teachingFingerLabel, teachingDegreeLabel, chordHarmonyLabels — the shared primitives every drawing function leans on. ━━━ PURITY IS THE WHOLE POINT OF THIS SLICE ━━━ Every one of these is a pure function of its arguments. None touches hwState. None closes over the canvas context — roundRect() already took `ctx` explicitly, and the rest need nothing but numbers. project() reads only the module-level constants from #914. That matters because createHighway() is a FACTORY: a plugin can build a second highway for its own panel, so anything holding per-instance state must be PASSED hwState rather than importing it, or two panels silently share one clock and palette. These six hold no state at all, so they move VERBATIM — the module boundary is invisible to every caller. The asserts are mechanical and in the extractor: it REFUSES to move a function whose body mentions hwState, or that references `ctx` without taking it as a parameter. Purity is checked, not assumed. ━━━ WHAT IS DELIBERATELY LEFT BEHIND ━━━ The four primitives that DO need hwState — fretX, fillTextReadable, _noteState, _paintGemGlow — stay in the factory for now. They need an explicit hwState parameter threaded through 53 call sites, which is a real behavioural change and belongs in its own commit rather than smuggled in beside a provably-identical move. Separating the provable from the risky is the whole discipline of this epic. TESTS. Three harnesses brace-match these functions out of the source and run them in a sandbox; they now read static/js/highway-geometry.js. `export function x` still contains `function x`, so the extractor needed no change — only the path. VERIFIED. A/B against origin/main: 15 probes IDENTICAL, zero page errors. PERF GATE PASSES AT 1.91ms against its 12ms budget — and this is the one that could plausibly have cost something: project() runs for every visible note on every frame and is now a CROSS-MODULE call. It costs nothing measurable. That is the answer #910 was built to give. node 1045, pytest 2416, ESLint 0, Codex 0. Co-authored-by: Claude Opus 4.8 (1M context) <noreply@anthropic.com>