fix(packages): add PackageRecipe serialization

ebuild/packages/recipe.py

@@ -89,6 +89,23 @@ def validate(self) -> None:
                 f"Must be one of {self.VALID_BUILD_SYSTEMS}."
             )
 
+    def to_dict(self) -> Dict[str, Any]:
+        """Serialize the recipe using the canonical YAML recipe schema."""
+        return {
+            "package": self.name,
+            "version": self.version,
+            "description": self.description,
+            "license": self.license,
+            "url": self.url,
+            "checksum": self.checksum,
+            "build": self.build_system,
+            "dependencies": list(self.dependencies),
+            "patches": list(self.patches),
+            "configure_args": list(self.configure_args),
+            "build_args": list(self.build_args),
+            "install_args": list(self.install_args),
+        }
+
 
 def _parse_string_list(
     raw: Dict[str, Any],

tests/unit/test_recipe.py

@@ -0,0 +1,21 @@
+from ebuild.packages.recipe import PackageRecipe
+
+
+def test_package_recipe_to_dict_uses_canonical_schema():
+    recipe = PackageRecipe(
+        name="demo",
+        version="1.0.0",
+        url="https://example.com/demo.tar.gz",
+        build_system="cmake",
+        dependencies=["dep"],
+    )
+
+    data = recipe.to_dict()
+
+    assert data["package"] == "demo"
+    assert data["version"] == "1.0.0"
+    assert data["url"] == "https://example.com/demo.tar.gz"
+    assert data["build"] == "cmake"
+    assert data["dependencies"] == ["dep"]
+    assert "name" not in data
+    assert "build_system" not in data