Squashed 'l1/' content from commit 670aa58

git-subtree-dir: l1
git-subtree-split: 670aa582df99e87fca7c247b949baf452e8c234f

sexp_effects/effects/grayscale.sexp

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+;; Grayscale effect - converts to grayscale
+;; Uses vectorized mix-gray primitive for fast processing
+(require-primitives "image")
+
+(define-effect grayscale
+  :params ()
+  (image:grayscale frame))