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

lang/src/compiler/pipeline_v2/emit_call_box.hako

@@ -37,8 +37,8 @@ static box EmitCallBox {
     return "\"" + out + "\""
   }
   emit_call_int_args(name, args) {
-    name = match name { null => "", _ => name }
-    args = match args { null => [], _ => args }
+    if name == null { name = "" }
+    if args == null { args = [] }
     // JSON v0 shape (HeaderEmitBox contract): {functions:[{name,params,blocks:[{id,instructions}]}]}
     // Materialize immediate int args: r1..rN; mir_call Extern(name)(r1..rN)->rK; ret rK
     local s = "" + args

lang/src/compiler/pipeline_v2/emit_compare_box.hako

@@ -54,8 +54,9 @@ static box EmitCompareBox {
 
   emit_compare_cfg3(lhs, rhs, cmp, materialize, trace) {
     if trace == 1 { print("[emit] compare lhs=" + lhs + " rhs=" + rhs + " cmp=" + cmp + " mat=" + materialize) }
-    // normalize cmp via match
-    cmp = match cmp { null => "Gt", "" => "Gt", _ => cmp }
+    // normalize cmp (null/empty → Gt)
+    if cmp == null { cmp = "Gt" }
+    if cmp == "" { cmp = "Gt" }
     // string直組み
     local lhs_s = EmitCompareBox._to_str(lhs)
     local rhs_s = EmitCompareBox._to_str(rhs)

lang/src/compiler/pipeline_v2/emit_method_box.hako

@@ -32,8 +32,8 @@ static box EmitMethodBox {
     return "\"" + out + "\""
   }
   emit_method_int_args(method, recv_val, args) {
-    method = match method { null => "", _ => method }
-    args = match args { null => [], _ => args }
+    if method == null { method = "" }
+    if args == null { args = [] }
     // Shape: const recv->r1; const args r2..rN; mir_call Method(method, r1, r2..)->rK; ret rK
     local s = "" + args
     local pos = 0

lang/src/compiler/pipeline_v2/emit_newbox_box.hako

@@ -10,8 +10,8 @@ using "lang/src/compiler/pipeline_v2/local_ssa_box.hako" as LocalSSABox
 
 static box EmitNewBoxBox {
   emit_newbox_int_args(class_name, args) {
-    class_name = match class_name { null => "", _ => class_name }
-    args = match args { null => [], _ => args }
+    if class_name == null { class_name = "" }
+    if args == null { args = [] }
     // ArgsParserBox 正規化 → BlockBuilder 直結
     local vals = Stage1ArgsParserBox.parse_ints(args)
     if vals == null { return null }
@@ -22,8 +22,8 @@ static box EmitNewBoxBox {
 
   // JSON v1 (MirCall) emission — experimental, shape-only
   emit_newbox_int_args_v1(class_name, args) {
-    class_name = match class_name { null => "", _ => class_name }
-    args = match args { null => [], _ => args }
+    if class_name == null { class_name = "" }
+    if args == null { args = [] }
     // 同形出力（shared builder に一本化）
     local vals = Stage1ArgsParserBox.parse_ints(args)
     if vals == null { return null }

lang/src/compiler/pipeline_v2/mir_call_box.hako

@@ -11,8 +11,8 @@ using "lang/src/shared/mir/json_emit_box.hako" as JsonEmitBox
 static box MirCallBox {
   // Global(name, args:int[])
   emit_call_v1(name, args) {
-    name = match name { null => "", _ => name }
-    args = match args { null => [], _ => args }
+    if name == null { name = "" }
+    if args == null { args = [] }
     local s = "" + args
     local pos = 0
     local n = 0
@@ -36,8 +36,8 @@ static box MirCallBox {
 
   // Method(method, recv:int, args:int[])
   emit_method_v1(method, recv_val, args) {
-    method = match method { null => "", _ => method }
-    args = match args { null => [], _ => args }
+    if method == null { method = "" }
+    if args == null { args = [] }
     local s = "" + args
     local pos = 0
     local n = 0
@@ -63,8 +63,8 @@ static box MirCallBox {
 
   // Constructor(class, args:int[])
   emit_newbox_v1(class_name, args) {
-    class_name = match class_name { null => "", _ => class_name }
-    args = match args { null => [], _ => args }
+    if class_name == null { class_name = "" }
+    if args == null { args = [] }
     local s = "" + args
     local pos = 0
     local n = 0