fix(parser): keep signature in decorated Python skeleton

skeletonPythonNode took lines[0] of a decorated_definition, which is the first @decorator line, dropping the def/class signature entirely. Now emit the decorator line(s) then recurse into the wrapped definition so its signature is preserved. Adds skeleton_test.go (decorated + plain function).

internal/parser/skeleton.go

@@ -215,7 +215,34 @@ func skeletonPythonNode(node *sitter.Node, content []byte, sb *strings.Builder,
 			skeletonPythonNode(child, content, sb, indent)
 		}
 		return
-	case "function_definition", "decorated_definition":
+	case "decorated_definition":
+		// Emit the decorator line(s), then render the wrapped definition so its
+		// signature (def/class) is preserved — taking lines[0] of the whole node
+		// would keep only the first decorator and drop the signature entirely.
+		var def *sitter.Node
+		for i := 0; i < int(node.NamedChildCount()); i++ {
+			if child := node.NamedChild(i); child != nil {
+				if t := child.Type(); t == "function_definition" || t == "class_definition" {
+					def = child
+					break
+				}
+			}
+		}
+		if def != nil {
+			decText := strings.TrimRight(string(content[node.StartByte():def.StartByte()]), "\n")
+			for _, dl := range strings.Split(decText, "\n") {
+				if strings.TrimSpace(dl) == "" {
+					continue
+				}
+				sb.WriteString(indent)
+				sb.WriteString(dl)
+				sb.WriteString("\n")
+			}
+			skeletonPythonNode(def, content, sb, indent)
+			return
+		}
+		fallthrough
+	case "function_definition":
 		nodeText := string(content[node.StartByte():node.EndByte()])
 		lines := strings.SplitN(nodeText, "\n", 2)
 		sb.WriteString(indent)

internal/parser/skeleton_test.go

@@ -0,0 +1,48 @@
+package parser
+
+import (
+	"context"
+	"strings"
+	"testing"
+)
+
+// A decorated Python function must keep BOTH its decorator(s) and its def
+// signature in the skeleton — previously only the first decorator survived and
+// the signature was dropped.
+func TestSkeletonPythonDecoratedFunction(t *testing.T) {
+	r := NewRegistry()
+	defer r.Close()
+
+	src := "@app.route(\"/\")\n" +
+		"def home():\n" +
+		"    return \"hi\"\n"
+
+	out, _, err := SkeletonFile(context.Background(), r, "app.py", []byte(src))
+	if err != nil {
+		t.Fatalf("SkeletonFile error: %v", err)
+	}
+	if !strings.Contains(out, "@app.route(\"/\")") {
+		t.Errorf("skeleton lost decorator, got:\n%s", out)
+	}
+	if !strings.Contains(out, "def home():") {
+		t.Errorf("skeleton lost def signature, got:\n%s", out)
+	}
+	if strings.Contains(out, "return \"hi\"") {
+		t.Errorf("skeleton should elide the body, got:\n%s", out)
+	}
+}
+
+// A plain (undecorated) Python function still renders its signature + body stub.
+func TestSkeletonPythonPlainFunction(t *testing.T) {
+	r := NewRegistry()
+	defer r.Close()
+
+	src := "def add(a, b):\n    return a + b\n"
+	out, _, err := SkeletonFile(context.Background(), r, "m.py", []byte(src))
+	if err != nil {
+		t.Fatalf("SkeletonFile error: %v", err)
+	}
+	if !strings.Contains(out, "def add(a, b):") {
+		t.Errorf("skeleton lost signature, got:\n%s", out)
+	}
+}