crates/console/prometeu-bytecode/src/model.rs

@@ -750,7 +750,7 @@ mod tests {
     #[test]
     fn test_invalid_magic() {
         let mut data = create_header(0);
-        data[0] = b'X';
+        data[0..4].copy_from_slice(b"PBS\0");
         assert_eq!(BytecodeLoader::load(&data), Err(LoadError::InvalidMagic));
     }
 

crates/console/prometeu-vm/src/virtual_machine.rs

@@ -2695,6 +2695,13 @@ mod tests {
         assert_eq!(vm.pc, 0);
         assert_eq!(vm.program.rom.len(), 2);
         assert_eq!(vm.cycles, 0);
+
+        vm.prepare_boot_call();
+        let mut native = MockNative;
+        let mut ctx = HostContext::new(None);
+        let report = vm.run_budget(100, &mut native, &mut ctx).expect("run loaded PBX");
+        assert_eq!(report.reason, LogicalFrameEndingReason::Halted);
+        assert!(vm.is_halted());
     }
 
     #[test]

crates/dev/prometeu-quality-checks/tests/pvm_frontend_neutrality.rs

@@ -0,0 +1,74 @@
+use std::fs;
+use std::path::{Path, PathBuf};
+
+const TARGET_MANIFESTS: &[&str] =
+    &["crates/console/prometeu-bytecode/Cargo.toml", "crates/console/prometeu-vm/Cargo.toml"];
+
+const FORBIDDEN_DEPENDENCY_FRAGMENTS: &[&str] = &["compiler", "frontend"];
+
+#[test]
+fn pbx_and_pvm_crates_must_not_depend_on_compiler_or_frontend_crates() {
+    let workspace_root = find_workspace_root().expect("runtime workspace root");
+    let mut violations = Vec::new();
+
+    for relative_path in TARGET_MANIFESTS {
+        let manifest_path = workspace_root.join(relative_path);
+        let manifest = fs::read_to_string(&manifest_path)
+            .unwrap_or_else(|error| panic!("failed to read {}: {error}", manifest_path.display()));
+
+        for dependency in dependency_names(&manifest) {
+            let normalized = dependency.to_ascii_lowercase();
+            if FORBIDDEN_DEPENDENCY_FRAGMENTS.iter().any(|fragment| normalized.contains(fragment)) {
+                violations.push(format!("{relative_path}: forbidden dependency `{dependency}`"));
+            }
+        }
+    }
+
+    assert!(
+        violations.is_empty(),
+        "PBX/PVM crates must remain independent of compiler and frontend crates:\n{}",
+        violations.join("\n")
+    );
+}
+
+fn dependency_names(manifest: &str) -> Vec<&str> {
+    let mut names = Vec::new();
+    let mut in_dependency_section = false;
+
+    for raw_line in manifest.lines() {
+        let line = raw_line.trim();
+        if line.starts_with('[') && line.ends_with(']') {
+            let section = &line[1..line.len() - 1];
+            in_dependency_section = section == "dependencies"
+                || section == "dev-dependencies"
+                || section == "build-dependencies"
+                || section.ends_with(".dependencies")
+                || section.ends_with(".dev-dependencies")
+                || section.ends_with(".build-dependencies");
+            continue;
+        }
+
+        if !in_dependency_section || line.is_empty() || line.starts_with('#') {
+            continue;
+        }
+
+        if let Some((name, _)) = line.split_once('=') {
+            names.push(name.trim().trim_matches('"'));
+        }
+    }
+
+    names
+}
+
+fn find_workspace_root() -> Option<PathBuf> {
+    let mut cursor = Path::new(env!("CARGO_MANIFEST_DIR")).to_path_buf();
+    loop {
+        let manifest = cursor.join("Cargo.toml");
+        if fs::read_to_string(&manifest).is_ok_and(|contents| contents.contains("[workspace]")) {
+            return Some(cursor);
+        }
+        if !cursor.pop() {
+            return None;
+        }
+    }
+}