Phase 21.2 Complete: VM Adapter正規実装 + devブリッジ完全撤去

## 🎉 Phase 21.2完全達成

### ✅ 実装完了
- VM static box 永続化（singleton infrastructure）
- devブリッジ完全撤去（adapter_dev.rs削除、by-name dispatch削除）
- .hako正規実装（MirCallV1Handler, AbiAdapterRegistry等）
- text-merge経路完全動作
- 全phase2120 adapter reps PASS（7テスト）

### 🐛 バグ修正
1. strip_local_decl修正
   - トップレベルのみlocal削除、メソッド内は保持
   - src/runner/modes/common_util/hako.rs:29

2. static box フィールド永続化
   - MirInterpreter singleton storage実装
   - me parameter binding修正（1:1マッピング）
   - getField/setField string→singleton解決
   - src/backend/mir_interpreter/{mod,exec,handlers/boxes_object_fields}.rs

3. Map.len alias rc=0修正
   - [map/missing]パターン検出でnull扱い（4箇所）
   - lang/src/vm/boxes/mir_call_v1_handler.hako:91-93,131-133,151-153,199-201

### 📁 主要変更ファイル

#### Rust（VM Runtime）
- src/backend/mir_interpreter/mod.rs - static box singleton storage
- src/backend/mir_interpreter/exec.rs - parameter binding fix
- src/backend/mir_interpreter/handlers/boxes_object_fields.rs - singleton resolution
- src/backend/mir_interpreter/handlers/calls.rs - dev bridge removal
- src/backend/mir_interpreter/utils/mod.rs - adapter_dev module removal
- src/backend/mir_interpreter/utils/adapter_dev.rs - DELETED (7555 bytes)
- src/runner/modes/vm.rs - static box declaration collection
- src/runner/modes/common_util/hako.rs - strip_local_decl fix
- src/instance_v2.rs - Clone implementation

#### Hako (.hako実装)
- lang/src/vm/boxes/mir_call_v1_handler.hako - [map/missing] detection
- lang/src/vm/boxes/abi_adapter_registry.hako - NEW (adapter registry)
- lang/src/vm/helpers/method_alias_policy.hako - method alias support

#### テスト
- tools/smokes/v2/profiles/quick/core/phase2120/s3_vm_adapter_*.sh - 7 new tests

### 🎯 テスト結果
```
✅ s3_vm_adapter_array_len_canary_vm.sh
✅ s3_vm_adapter_array_len_per_recv_canary_vm.sh
✅ s3_vm_adapter_array_length_alias_canary_vm.sh
✅ s3_vm_adapter_array_size_alias_canary_vm.sh
✅ s3_vm_adapter_map_len_alias_state_canary_vm.sh
✅ s3_vm_adapter_map_length_alias_state_canary_vm.sh
✅ s3_vm_adapter_map_size_struct_canary_vm.sh
```

環境フラグ: HAKO_ABI_ADAPTER=1 HAKO_ABI_ADAPTER_DEV=0

### 🏆 設計品質
- ✅ ハードコード禁止（AGENTS.md 5.1）完全準拠
- ✅ 構造的・一般化設計（特定Box名のif分岐なし）
- ✅ 後方互換性保持（既存コード破壊ゼロ）
- ✅ text-merge経路（.hako依存関係正しくマージ）

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

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

tools/hako_check/render/graphviz.hako

@@ -0,0 +1,113 @@
+// tools/hako_check/render/graphviz.hako — GraphvizRenderBox (MVP)
+// Render minimal DOT graph from one or more Analysis IRs.
+
+using selfhost.shared.common.string_helpers as Str
+
+static box GraphvizRenderBox {
+  render_multi(irs) {
+    // irs: ArrayBox of IR Map
+    print("digraph Hako {")
+    // optional graph attributes (kept minimal)
+    // print("  rankdir=LR;")
+    // Node and edge sets to avoid duplicates
+    local nodes = new MapBox()
+    local edges = new MapBox()
+    if irs != null {
+      local gi = 0
+      while gi < irs.size() {
+        local ir = irs.get(gi)
+        me._render_ir(ir, nodes, edges)
+        gi = gi + 1
+      }
+    }
+    // Emit nodes
+    local itn = nodes
+    // Map iteration: keys() not available → store labels as keys in map
+    // Use a synthetic loop by scanning a known list captured during _render_ir
+    // For MVP, nodes map has key=name, value=1
+    // We cannot iterate map keys deterministically; accept arbitrary order.
+    // Re-emitting by re-collecting from edges as well (ensures endpoints appear).
+    // Emit edges
+    if edges != null {
+      // edges map key = from + "\t" + to
+      // naive iteration by trying to get keys from a stored list
+      // We kept an ArrayBox under edges.get("__keys__") for listing
+      local ks = edges.get("__keys__")
+      if ks != null {
+        local ei = 0
+        while ei < ks.size() {
+          local key = ks.get(ei)
+          local tab = key.indexOf("\t")
+          if tab > 0 {
+            local src = key.substring(0, tab)
+            local dst = key.substring(tab+1)
+            print("  \"" + src + "\" -> \"" + dst + "\";")
+            // also register nodes (in case they weren’t explicitly collected)
+            nodes.set(src, 1)
+            nodes.set(dst, 1)
+          }
+          ei = ei + 1
+        }
+      }
+    }
+    // Now emit nodes at the end for any isolated methods
+    // Rebuild a list of node keys from a synthetic array stored under nodes.get("__keys__")
+    local nk = nodes.get("__keys__")
+    if nk != null {
+      local ni = 0
+      while ni < nk.size() {
+        local name = nk.get(ni)
+        print("  \"" + name + "\";")
+        ni = ni + 1
+      }
+    }
+    print("}")
+    return 0
+  }
+  _render_ir(ir, nodes, edges) {
+    if ir == null { return }
+    // methods
+    local ms = ir.get("methods")
+    if ms != null {
+      local mi = 0
+      while mi < ms.size() {
+        me._add_node(nodes, ms.get(mi))
+        mi = mi + 1
+      }
+    }
+    // calls
+    local cs = ir.get("calls")
+    if cs != null {
+      local ci = 0
+      while ci < cs.size() {
+        local c = cs.get(ci)
+        local f = c.get("from")
+        local t = c.get("to")
+        me._add_edge(edges, f, t)
+        ci = ci + 1
+      }
+    }
+  }
+  _add_node(nodes, name) {
+    if name == null { return }
+    nodes.set(name, 1)
+    // also store a list of keys for emitting (since Map has no key iterator)
+    local arr = nodes.get("__keys__"); if arr == null { arr = new ArrayBox(); nodes.set("__keys__", arr) }
+    // avoid duplicates
+    local seen = 0
+    local i = 0; while i < arr.size() { if arr.get(i) == name { seen = 1; break } i = i + 1 }
+    if seen == 0 { arr.push(name) }
+  }
+  _add_edge(edges, src, dst) {
+    if src == null || dst == null { return }
+    local key = src + "\t" + dst
+    if edges.get(key) == null { edges.set(key, 1) }
+    local arr = edges.get("__keys__"); if arr == null { arr = new ArrayBox(); edges.set("__keys__", arr) }
+    // avoid duplicates
+    local seen = 0
+    local i = 0; while i < arr.size() { if arr.get(i) == key { seen = 1; break } i = i + 1 }
+    if seen == 0 { arr.push(key) }
+  }
+}
+
+static box GraphvizRenderMain { method main(args) { return 0 } }