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/echo.sexp

@@ -6,10 +6,10 @@
     (num_echoes :type int :default 4 :range [1 20])
     (decay :type float :default 0.5 :range [0 1])
   )
-  (let* ((buffer (state-get 'buffer (list)))
+  (let* ((buffer (state-get "buffer" (list)))
          (new-buffer (take (cons frame buffer) (+ num_echoes 1))))
     (begin
-      (state-set 'buffer new-buffer)
+      (state-set "buffer" new-buffer)
       ;; Blend frames with decay
       (if (< (length new-buffer) 2)
           frame