Phase 12: 統一TypeBox ABI実装開始 - ChatGPT5による極小コアABI基盤構築

- TypeBox ABI雛形: メソッドスロット管理システム追加
- Type Registry: Array/Map/StringBoxの基本メソッド定義
- Host API: C ABI逆呼び出しシステム実装
- Phase 12ドキュメント整理: 設計文書統合・アーカイブ化
- MIR Builder: クリーンアップと分離実装完了

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

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

src/mir/builder/utils.rs

@@ -0,0 +1,65 @@
+use std::fs;
+
+// Resolve include path using nyash.toml include.roots if present
+pub(super) fn resolve_include_path_builder(filename: &str) -> String {
+    if filename.starts_with("./") || filename.starts_with("../") {
+        return filename.to_string();
+    }
+    let parts: Vec<&str> = filename.splitn(2, '/').collect();
+    if parts.len() == 2 {
+        let root = parts[0];
+        let rest = parts[1];
+        let cfg_path = "nyash.toml";
+        if let Ok(toml_str) = fs::read_to_string(cfg_path) {
+            if let Ok(toml_val) = toml::from_str::<toml::Value>(&toml_str) {
+                if let Some(include) = toml_val.get("include") {
+                    if let Some(roots) = include.get("roots").and_then(|v| v.as_table()) {
+                        if let Some(root_path) = roots.get(root).and_then(|v| v.as_str()) {
+                            let mut base = root_path.to_string();
+                            if !base.ends_with('/') && !base.ends_with('\\') {
+                                base.push('/');
+                            }
+                            return format!("{}{}", base, rest);
+                        }
+                    }
+                }
+            }
+        }
+    }
+    format!("./{}", filename)
+}
+
+// Optional builder debug logging
+pub(super) fn builder_debug_enabled() -> bool {
+    std::env::var("NYASH_BUILDER_DEBUG").is_ok()
+}
+
+pub(super) fn builder_debug_log(msg: &str) {
+    if builder_debug_enabled() {
+        eprintln!("[BUILDER] {}", msg);
+    }
+}
+
+// PHI-based return type inference helper
+pub(super) fn infer_type_from_phi(
+    function: &super::MirFunction,
+    ret_val: super::ValueId,
+    types: &std::collections::HashMap<super::ValueId, super::MirType>,
+) -> Option<super::MirType> {
+    for (_bid, bb) in function.blocks.iter() {
+        for inst in bb.instructions.iter() {
+            if let super::MirInstruction::Phi { dst, inputs } = inst {
+                if *dst == ret_val {
+                    let mut it = inputs.iter().filter_map(|(_, v)| types.get(v));
+                    if let Some(first) = it.next() {
+                        if it.all(|mt| mt == first) {
+                            return Some(first.clone());
+                        }
+                    }
+                }
+            }
+        }
+    }
+    None
+}
+