Implement Phase 8.9: Remove transparency system and add weak reference nullification

Co-authored-by: moe-charm <217100418+moe-charm@users.noreply.github.com>

src/parser/expressions.rs

@@ -516,9 +516,13 @@ impl NyashParser {
                 }
             }
         } else {
-            // DOTがない場合: from Parent() 形式 - 透明化システム
-            // 🔥 Pack透明化: Parent名をmethod名として使用
-            parent.clone()
+            // DOTがない場合: from Parent() 形式 - 透明化システム廃止
+            // Phase 8.9: 明示的birth()構文を強制
+            let line = self.current_token().line;
+            return Err(ParseError::TransparencySystemRemoved {
+                suggestion: format!("Use 'from {}.birth()' instead of 'from {}()'", parent, parent),
+                line,
+            });
         };
         
         // 引数リストをパース

src/parser/mod.rs

@@ -77,6 +77,9 @@ pub enum ParseError {
     #[error("🚨 Infinite loop detected in parser at {location} - token: {token:?} at line {line}")]
     InfiniteLoop { location: String, token: TokenType, line: usize },
     
+    #[error("🔥 Transparency system removed: {suggestion} at line {line}")]
+    TransparencySystemRemoved { suggestion: String, line: usize },
+    
     #[error("Tokenize error: {0}")]
     TokenizeError(#[from] TokenizeError),
 }