Add JAX typography, xector primitives, deferred effect chains, and GPU streaming

- Add JAX text rendering with font atlas, styled text placement, and typography primitives
- Add xector (element-wise/reduction) operations library and sexp effects
- Add deferred effect chain fusion for JIT-compiled effect pipelines
- Expand drawing primitives with font management, alignment, shadow, and outline
- Add interpreter support for function-style define and require
- Add GPU persistence mode and hardware decode support to streaming
- Add new sexp effects: cell_pattern, halftone, mosaic, and derived definitions
- Add path registry for asset resolution
- Add integration, primitives, and xector tests

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

sexp_effects/effects/ascii_art.sexp

@@ -5,7 +5,7 @@
   :params (
     (char_size :type int :default 8 :range [4 32])
     (alphabet :type string :default "standard")
-    (color_mode :type string :default "color" :desc ""color", "mono", "invert", or any color name/hex")
+    (color_mode :type string :default "color" :desc "color, mono, invert, or any color name/hex")
     (background_color :type string :default "black" :desc "background color name/hex")
     (invert_colors :type int :default 0 :desc "swap foreground and background colors")
     (contrast :type float :default 1.5 :range [1 3])