fix: trusted_data now stores variable name and not the data, this was a critical bug

previously hardcoded 'mitra_trusted' as filename, bypassing variable name entirely
also never stored data in VFS so verification had no stored state to compare against
now creates VFS entry with correct variable name then verifies through vfs.read()
means trusted_data verification goes through the same provenance enforcement as all reads

Author: abhiprd2000

src/mitra/interpreter.rs

@@ -22,7 +22,8 @@ impl<'a> Interpreter<'a> {
                 }
                 AstNode::TrustedData { name, content } => {
                     println!("[mitra] trusted_data {}", name);
-                    let td = TrustedData::new("mitra_trusted", content.as_bytes());
+                    self.vfs.create(&name, content.as_bytes());
+                    let td = TrustedData::new(&name, content.as_bytes());
                     let ok = td.verify_or_halt();
                     if ok {
                         println!("[mitra] trusted_data \"{}\" approved for execution", name);