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

ext/zig/tests/native_bundle_bools_test.c

@@ -0,0 +1,60 @@
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include <time.h>
+#include "../include/arboricx.h"
+
+static uint8_t *read_file(const char *path, size_t *out_len) {
+    FILE *f = fopen(path, "rb");
+    if (!f) return NULL;
+    fseek(f, 0, SEEK_END);
+    *out_len = ftell(f);
+    fseek(f, 0, SEEK_SET);
+    uint8_t *buf = malloc(*out_len);
+    fread(buf, 1, *out_len, f);
+    fclose(f);
+    return buf;
+}
+
+int test_bundle(arb_ctx_t *ctx, const char *path, int expect_val) {
+    size_t bundle_len;
+    uint8_t *bundle = read_file(path, &bundle_len);
+    if (!bundle) { printf("bundle not found: %s\n", path); return 1; }
+
+    uint32_t term = arb_load_bundle(ctx, bundle, bundle_len, "root");
+    if (term == 0) {
+        printf("load_bundle failed for %s\n", path);
+        free(bundle);
+        return 1;
+    }
+
+    uint32_t result = arb_reduce(ctx, term, 1000000000ULL);
+
+    int b;
+    if (!arb_to_bool(ctx, result, &b)) {
+        printf("to_bool failed for %s\n", path);
+        free(bundle);
+        return 1;
+    }
+    printf("%s result bool=%d (expected %d)\n", path, b, expect_val);
+    if (b != expect_val) {
+        printf("MISMATCH!\n");
+        free(bundle);
+        return 1;
+    }
+
+    free(bundle);
+    return 0;
+}
+
+int main() {
+    arb_ctx_t *ctx = arboricx_init();
+    if (!ctx) { printf("init failed\n"); return 1; }
+
+    if (test_bundle(ctx, "../../test/fixtures/true.arboricx", 1) != 0) return 1;
+    if (test_bundle(ctx, "../../test/fixtures/false.arboricx", 0) != 0) return 1;
+
+    arboricx_free(ctx);
+    printf("All bool tests passed.\n");
+    return 0;
+}