Start loading the dot-grid shader from build

So a grid that becomes eligible after it mounts still gets the shader,
and note why one shader per grid is safe to reuse across its pictures.

Co-Authored-By: Claude Opus 5.5 (1M context) <noreply@anthropic.com>
5421bbead6Dara Adedeji committed on 10/6/2026, 2:14:26 AMparentf7ad2ea

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