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/strobe.sexp

@@ -5,12 +5,12 @@
   :params (
     (frame_rate :type int :default 12 :range [1 60])
   )
-  (let* ((held (state-get 'held nil))
-         (held-until (state-get 'held-until 0))
+  (let* ((held (state-get "held" nil))
+         (held-until (state-get "held-until" 0))
          (frame-duration (/ 1 frame_rate)))
     (if (or (core:is-nil held) (>= t held-until))
         (begin
-          (state-set 'held (copy frame))
-          (state-set 'held-until (+ t frame-duration))
+          (state-set "held" (copy frame))
+          (state-set "held-until" (+ t frame-duration))
           frame)
         held)))