Analyzer安定化完了: NYASH_DISABLE_PLUGINS=1復元 + plugin無効化根治

## 修正内容
1. **hako_check.sh/run_tests.sh**: NYASH_DISABLE_PLUGINS=1 + NYASH_BOX_FACTORY_POLICY=builtin_first追加
2. **src/box_factory/plugin.rs**: NYASH_DISABLE_PLUGINS=1チェック追加
3. **src/box_factory/mod.rs**: plugin shortcut pathでNYASH_DISABLE_PLUGINS尊重
4. **tools/hako_check/render/graphviz.hako**: smart quotes修正（parse error解消）

## 根本原因
- NYASH_USE_PLUGIN_BUILTINS=1が自動設定され、ArrayBox/MapBoxがplugin経由で生成を試行
- bid/registry.rsで"Plugin loading temporarily disabled"の状態でも試行されエラー
- mod.rs:272のshortcut pathがNYASH_DISABLE_PLUGINSを無視していた

## テスト結果
- 10/11 PASS（HC011,13-18,21-22,31）
- HC012: 既存issue（JSON安定化未完）

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude <noreply@anthropic.com>

tools/hako_parser/parser_core.hako

@@ -1,4 +1,4 @@
-// tools/hako_parser/parser_core.hako — HakoParserCoreBox (token-based MVP)
+// tools/hako_parser/parser_core.hako - HakoParserCoreBox (token-based MVP)
 using selfhost.shared.common.string_helpers as Str
 using tools.hako_parser.tokenizer as HakoTokenizerBox
 
@@ -6,11 +6,13 @@ static box HakoParserCoreBox {
   // Parse .hako source into minimal AST map:
   // {
   //   uses: Array<String>,
+  //   aliases: Array<{name,alias}>,
   //   boxes: Array<{name,is_static,methods:Array<{name,arity,span}>}>
   // }
   parse(text) {
     local ast = new MapBox()
     ast.set("uses", new ArrayBox())
+    ast.set("aliases", new ArrayBox())
     ast.set("boxes", new ArrayBox())
     ast.set("includes", new ArrayBox())
     if text == null { return ast }
@@ -27,9 +29,18 @@ static box HakoParserCoreBox {
         p = me._advance(p, N)
         local t1 = me._peek(toks, p, N)
         if me._eq(t1, "STRING") == 1 {
-          ast.get("uses").push(t1.get("lexeme")); p = me._advance(p, N)
+          local mod_name = t1.get("lexeme"); ast.get("uses").push(mod_name); p = me._advance(p, N)
           // optional: as Alias
-          local t2 = me._peek(toks, p, N); if me._eq(t2, "AS") == 1 { p = me._advance(p, N); local t3=me._peek(toks, p, N); if me._eq(t3, "IDENT")==1 { p = me._advance(p, N) } }
+          local t2 = me._peek(toks, p, N);
+          if me._eq(t2, "AS") == 1 {
+            p = me._advance(p, N)
+            local t3 = me._peek(toks, p, N)
+            if me._eq(t3, "IDENT") == 1 {
+              local alias = t3.get("lexeme"); p = me._advance(p, N)
+              local rec = new MapBox(); rec.set("name", mod_name); rec.set("alias", alias)
+              ast.get("aliases").push(rec)
+            }
+          }
         } else {
           // tolerate malformed using; skip token
         }