fix(apple): keep the nested Rosetta registers of translated crash reports

A translated process records Rosetta's registers in a nested threadState.rosetta object. The parser read it as one register, so every valid report from a Rosetta process came back partial with a threadState.rosetta.value mismatch, and the nested registers were dropped. Each nested member is now reported as rosetta.<name> and counts toward the register budget.

docs/apple-ips.md

@@ -38,6 +38,9 @@ address uses that row's own image base and offset. The recorded `inline` flag
 does not supply a missing offset or authorize borrowing another row's address.
 When `faultingThread` is missing or does not resolve to a recorded thread
 object, row-zero roles are `unknown`; the recorded lookup remains available.
+A translated process records Rosetta's registers in a nested
+`threadState.rosetta` object; each one is reported as `rosetta.<name>` and
+counts toward the register budget.
 `process.os_version` keeps the producer's dictionary (`train`, `build`,
 `release_type`, `is_embedded`) or the older string form. Image UUIDs are uppercase 8-4-4-4-12; an all-zero UUID
 or a missing `arch` is `uuid_unknown`. Image `source` letters keep their

src/native/apple/AppleIpsJsonShape.ts

@@ -96,6 +96,13 @@ const threadShape = (
         members: {
           flavor: SCALAR,
           x: { kind: "array", items: register, beforeItem: take.registers },
+          // Rosetta-translated processes nest their translator registers.
+          rosetta: {
+            kind: "object",
+            members: {},
+            rest: register,
+            beforeRest: take.registers,
+          },
         },
         rest: register,
         beforeRest: take.registers,

src/native/apple/AppleIpsParser.test.ts

@@ -500,6 +500,46 @@ it("reports wrong-type collections as partial instead of empty and complete", ()
   expect(empty.coverage.status).toBe("complete");
 });
 
+it("keeps the nested Rosetta registers of a translated process", () => {
+  const parsed = parse(
+    withBody(`{
+      "translated": true,
+      "threads": [
+        {
+          "threadState": {
+            "flavor": "x86_THREAD_STATE",
+            "rip": { "value": 4294983680 },
+            "rosetta": { "tmp0": { "value": 7 }, "tmp1": 8 }
+          }
+        }
+      ],
+      "usedImages": []
+    }`),
+  );
+  expect(parsed.threads[0]?.registers).toEqual([
+    {
+      name: "rip",
+      value: { decimal: "4294983680", hex: "0x100004000" },
+      description: null,
+    },
+    {
+      name: "rosetta.tmp0",
+      value: { decimal: "7", hex: "0x7" },
+      description: null,
+    },
+    {
+      name: "rosetta.tmp1",
+      value: { decimal: "8", hex: "0x8" },
+      description: null,
+    },
+  ]);
+  expect(parsed.coverage).toMatchObject({
+    status: "complete",
+    registers: 3,
+    type_mismatches: [],
+  });
+});
+
 it("records wrong-type rows, scalars and registers with their source path", () => {
   const parsed = parse(
     withBody(`{
@@ -511,7 +551,7 @@ it("records wrong-type rows, scalars and registers with their source path", () =
         7,
         {
           "frames": [{ "imageIndex": 99999999999, "imageOffset": "8" }, []],
-          "threadState": { "flavor": 1, "x": [1, "two", { "value": null }, {}], "rosetta": { "tmp0": 1 } }
+          "threadState": { "flavor": 1, "x": [1, "two", { "value": null }, {}], "rosetta": { "tmp0": "one" } }
         }
       ],
       "usedImages": [null, { "base": 1.0 }]
@@ -567,9 +607,9 @@ it("records wrong-type rows, scalars and registers with their source path", () =
       observed: "absent",
     },
     {
-      path: "body.threads[1].threadState.rosetta.value",
-      expected: "integer",
-      observed: "absent",
+      path: "body.threads[1].threadState.rosetta.tmp0",
+      expected: "integer or object with integer value",
+      observed: "string",
     },
     {
       path: "body.threads[1].threadState.flavor",

src/native/apple/AppleIpsParser.ts

@@ -175,6 +175,20 @@ const threadStateOf = (
   });
   for (const [key, entry] of Object.entries(members)) {
     if (key === "x" || key === "flavor") continue;
+    if (key === "rosetta") {
+      // A translated process records Rosetta's registers as a nested state.
+      const rosetta = read.object(entry, `${path}.rosetta`);
+      for (const [name, nested] of Object.entries(rosetta?.members ?? {})) {
+        const register = registerValue(
+          `rosetta.${name}`,
+          nested,
+          `${path}.rosetta.${name}`,
+          read,
+        );
+        if (register !== null) registers.push(register);
+      }
+      continue;
+    }
     const register = registerValue(key, entry, `${path}.${key}`, read);
     if (register !== null) registers.push(register);
   }