Split a script only where the boundary is real

Module split main.js is long enough that every new change starts with a search command. The risk is either one giant file or ten tiny files with unclear dependencies. Boundary test Responsibility, exports, dependency direction A module is a contract: what it owns and what it exposes. Scatter One function per file because modules sound professional. The file split makes the app easier to change. Split where responsibility is stable; keep wiring at the edge. 01 Find owner 02 Pick exports 03 Avoid cycles Owner Responsibility

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