feat(zig): native Arboricx bundle parser and C ABI

lib/arboricx-dispatch.tri

@@ -0,0 +1,23 @@
+!import "arboricx.tri" !Local
+!import "patterns.tri" !Local
+
+-- Multi-purpose kernel dispatch.
+--
+-- runArboricxTyped tag bundleBytes args
+--   tag 0 → hostTree   (runArboricxToTree)
+--   tag 1 → hostString (runArboricxToString)
+--   tag 2 → hostNumber (runArboricxToNumber)
+--   tag 3 → hostBool   (runArboricxToBool)
+--   tag 4 → hostList   (runArboricxToList)
+--   tag 5 → hostBytes  (runArboricxToBytes)
+--   otherwise → err 99 bundleBytes
+
+runArboricxTyped = (tag bs args :
+  match tag
+    [[(equal? hostTreeTag)   (_ : runArboricxToTree bs args)]
+     [(equal? hostStringTag) (_ : runArboricxToString bs args)]
+     [(equal? hostNumberTag) (_ : runArboricxToNumber bs args)]
+     [(equal? hostBoolTag)   (_ : runArboricxToBool bs args)]
+     [(equal? hostListTag)   (_ : runArboricxToList bs args)]
+     [(equal? hostBytesTag)  (_ : runArboricxToBytes bs args)]
+     [otherwise              (_ : err 99 bs)]])