runner: add NyVM wrapper core_bridge (canonicalize/dump) + opt-in wrapper canary; export module in common_util

src/runner/modes/common_util/core_bridge.rs

@@ -0,0 +1,23 @@
+/*!
+ * core_bridge.rs — NyVM wrapper bridge helpers
+ *
+ * Provides a minimal JSON canonicalizer for NyVmDispatcher wrapper path.
+ * Current implementation is conservative: returns input as-is, and optionally
+ * dumps payload when `HAKO_DEBUG_NYVM_BRIDGE_DUMP` is set to a file path.
+ */
+
+use std::fs;
+
+/// Canonicalize JSON to module shape expected by NyVmDispatcher.
+/// For now, this is a passthrough with optional debug dump.
+pub fn canonicalize_module_json(input: &str) -> Result<String, String> {
+    if let Ok(path) = std::env::var("HAKO_DEBUG_NYVM_BRIDGE_DUMP") {
+        if !path.trim().is_empty() {
+            if let Err(e) = fs::write(&path, input.as_bytes()) {
+                eprintln!("[bridge/dump] write error: {}", e);
+            }
+        }
+    }
+    Ok(input.to_string())
+}
+

src/runner/modes/common_util/mod.rs

@@ -10,3 +10,4 @@ pub mod io;
 pub mod selfhost;
 pub mod resolve;
 pub mod exec;
+pub mod core_bridge;