Grid placement, wave pressure, and upgrades in a clean circuit board theme.

Controls
Build an HTML5 tower defense demo (single file). Theme: circuit board grid with neon traces. Map: fixed path with 8-12 nodes; enemies follow the path. Towers: 3 types (rapid, splash, slow) with upgrades. Economy: earn credits per kill; upgrade between waves. UI: wave timer, credits, lives, selected tower info. Controls: click grid to place towers; 1/2/3 to switch type; R restart.
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