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/tokenizer.hako

@@ -1,4 +1,4 @@
-// tools/hako_parser/tokenizer.hako — HakoTokenizerBox (Stage-3 aware tokenizer, MVP)
+// tools/hako_parser/tokenizer.hako - HakoTokenizerBox (Stage-3 aware tokenizer, MVP)
 // Produces tokens with type, lexeme, line, col. Handles strings (escapes), numbers,
 // identifiers, and punctuation. Keywords are normalized to upper-case kinds.
 using selfhost.shared.common.string_helpers as Str
@@ -99,7 +99,7 @@ static box HakoTokenizerBox {
         local tok = new MapBox(); tok.set("type", sym_kind); tok.set("lexeme", ch); tok.set("line", line); tok.set("col", col)
         out.push(tok); i = i + 1; col = col + 1; continue
       }
-      // unknown char → emit as PUNC so parser can skip gracefully
+      // unknown char -> emit as PUNC so parser can skip gracefully
       local tok = new MapBox(); tok.set("type","PUNC"); tok.set("lexeme", ch); tok.set("line", line); tok.set("col", col)
       out.push(tok); i = i + 1; col = col + 1
     }