fix: align validation rust stub generator naming

Signed-off-by: lucarlig <luca.carlig@ibm.com>

Author: lucarlig

crates/validation_middleware_rust/Cargo.toml

@@ -12,7 +12,7 @@ name = "validation_middleware_rust"
 crate-type = ["cdylib", "rlib"]
 
 [[bin]]
-name = "stub_gen"
+name = "validation_middleware_rust_stub_gen"
 path = "src/bin/stub_gen.rs"
 
 [dependencies]

tests/unit/test_rust_workspace_layout.py

@@ -116,6 +116,26 @@ def test_workspace_crates_inherit_common_package_metadata() -> None:
     assert offenders == [], f"Workspace crate package metadata should be inherited from workspace: {offenders}"
 
 
+def test_stub_gen_bin_names_match_package_names() -> None:
+    offenders: list[str] = []
+
+    for cargo_toml in _tool_cargo_files():
+        crate_dir = cargo_toml.parent
+        if not (crate_dir / "src" / "bin" / "stub_gen.rs").exists():
+            continue
+
+        rel = cargo_toml.relative_to(REPO_ROOT)
+        manifest = _load_toml(cargo_toml)
+        package_name = manifest["package"]["name"]
+        expected_bin_name = f"{package_name}_stub_gen"
+        bins = manifest.get("bin", [])
+
+        if not any(bin_entry.get("name") == expected_bin_name for bin_entry in bins):
+            offenders.append(f"{rel}::{expected_bin_name}")
+
+    assert offenders == [], f"Stub generator bin names should follow <package>_stub_gen: {offenders}"
+
+
 def test_deny_config_tracks_stub_gen_unmaintained_unicode_advisories() -> None:
     workspace_dependencies = _load_toml(ROOT_CARGO_TOML)["workspace"]["dependencies"]
     deny_config = _load_toml(DENY_TOML)