chore: import upstream snapshot with attribution

native/zero-c/src/program_graph.c

@@ -0,0 +1,36 @@
+#include "program_graph.h"
+
+#include <stdlib.h>
+
+void z_program_graph_init(ZProgramGraph *graph) {
+  *graph = (ZProgramGraph){
+    .schema_version = 1,
+    .validation_state = Z_PROGRAM_GRAPH_VALIDATION_DECODED,
+    .module_identity = z_strdup("module:main"),
+  };
+}
+
+void z_program_graph_free(ZProgramGraph *graph) {
+  if (!graph) return;
+  for (size_t i = 0; i < graph->node_len; i++) {
+    free(graph->nodes[i].id);
+    free(graph->nodes[i].name);
+    free(graph->nodes[i].type);
+    free(graph->nodes[i].value);
+    free(graph->nodes[i].path);
+    free(graph->nodes[i].symbol_id);
+    free(graph->nodes[i].type_id);
+    free(graph->nodes[i].effect_id);
+    free(graph->nodes[i].node_hash);
+  }
+  for (size_t i = 0; i < graph->edge_len; i++) {
+    free(graph->edges[i].from);
+    free(graph->edges[i].to);
+    free(graph->edges[i].kind);
+  }
+  free(graph->module_identity);
+  free(graph->graph_hash);
+  free(graph->nodes);
+  free(graph->edges);
+  *graph = (ZProgramGraph){0};
+}