fix(native): retain valid Objective-C properties beside a malformed record (#3833)

* fix(native): retain valid Objective-C properties beside a malformed record

readObjcPropertyList decoded a whole property_list_t in one operation.
When a later entry's name pointer was unmapped, the list-level catch
discarded the properties already decoded. An empty property name passed
decoding and then failed schema validation of the whole result, so
inspect-native-dispatch-metadata exited 1 with no metadata.

Each property_t entry is now decoded on its own. A failing entry, or an
empty name, becomes a property_decode_failed issue at the entry address,
and sibling properties are retained. Incomplete-attribute issues also
report their entry address. List-header failures still fail only that
list.

Fixes #3336

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

* test(native): cover property record isolation on every platform

Move the synthetic Objective-C property Mach-O into a shared fixture and
decode it through decodeAppleDispatchMetadata in a portable test, so
Linux and Windows runs also catch a regression that drops valid sibling
properties. The macOS CLI cases keep exercising the built command.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

---------

Co-authored-by: Claude Opus 5.5 <noreply@anthropic.com>

src/native/AppleDispatchMetadata.test.ts

@@ -1,4 +1,5 @@
 import { describe, expect, it } from "vitest";
+import { machoWithPropertyAttributes } from "../../tests/fixtures/objcPropertyMacho.js";
 import { decodeAppleDispatchMetadata } from "./AppleDispatchMetadata.js";
 
 const base = 0x100000000n;
@@ -423,6 +424,38 @@ describe("Apple dispatch coverage ownership", () => {
   });
 });
 
+describe("malformed Objective-C property records", () => {
+  it.each([
+    ["an unmapped name", { secondNameOffset: 0x2000 }, "first", "0x100000518"],
+    ["an empty name", { firstName: "" }, "second", "0x100000508"],
+  ] as const)(
+    "retains the valid sibling of a property with %s",
+    (_, layout, kept, location) => {
+      const result = decodeAppleDispatchMetadata(
+        machoWithPropertyAttributes("Tq,N", layout),
+        100,
+        provenance,
+      );
+      expect(
+        result.objc_classes.map(({ name, properties }) => ({
+          name,
+          properties: properties.map((property) => property.name),
+        })),
+      ).toEqual([{ name: "Fixture", properties: [kept] }]);
+      expect(
+        result.coverage.find(
+          ({ facet }) => facet === "objc_properties_categories",
+        ),
+      ).toMatchObject({
+        status: "partial",
+        reason: expect.stringContaining(
+          `property_decode_failed at ${location}: Fixture: property`,
+        ),
+      });
+    },
+  );
+});
+
 describe("malformed Apple dispatch metadata", () => {
   it("retains valid class siblings when one class has an empty name", () => {
     const result = decodeAppleDispatchMetadata(