fix(dotnet): inspect native boundaries of non-managed and malformed PEs

`inspect_managed_native_boundaries` wrote the PE classification
(`not-managed` or `malformed`) into `coverage.state`, which accepts only
`complete`, `partial`, or `unavailable`. Its own result validation then
threw, so every native DLL and every PE with unreadable CLI metadata
failed as a generic execution failure advising a retry. The sibling
artifact and member inspectors succeed on the same files.

Report these files with `unavailable` coverage, as the member inspector
does, keeping the metadata status and parse issues.

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

src/dotnet/ManagedNativeBoundaryInspector.test.ts

@@ -101,4 +101,32 @@ describe("managed native boundaries", () => {
       expect.objectContaining({ code: "invalid-metadata-root" }),
     ]);
   });
+
+  it("reports unavailable boundaries for native and malformed PE files", () => {
+    const nativeBytes = buildNativePeFixture();
+    const native = inspectManagedNativeBoundariesBytes(
+      nativeBytes,
+      managedPeFixtureTarget(nativeBytes),
+    );
+    expect(native).toMatchObject({
+      metadata: { status: "absent" },
+      pinvoke_imports: [],
+      coverage: { state: "unavailable", issues: [] },
+    });
+
+    const malformedBytes = buildManagedPeFixture({
+      corruptMetadataSignature: true,
+    });
+    const malformed = inspectManagedNativeBoundariesBytes(
+      malformedBytes,
+      managedPeFixtureTarget(malformedBytes),
+    );
+    expect(malformed).toMatchObject({
+      metadata: { status: "malformed" },
+      coverage: {
+        state: "unavailable",
+        issues: [expect.objectContaining({ code: "invalid-metadata-root" })],
+      },
+    });
+  });
 });

src/dotnet/ManagedNativeBoundaryInspector.ts

@@ -29,10 +29,11 @@ import {
 
 type Inventory = ReturnType<typeof readManagedMetadataInventory>;
 
+/** Report a PE whose CLI data is absent or cannot be admitted. */
 const emptyInspection = (
   target: BinaryTarget,
   bytes: Buffer,
-  classification: "not-managed" | "malformed" | "not-available" | "managed",
+  classification: "not-managed" | "malformed",
   issues: readonly ManagedParseIssue[] = [],
 ): ManagedNativeBoundaryInspection =>
   managedNativeBoundaryInspectionSchema.parse({
@@ -44,10 +45,7 @@ const emptyInspection = (
     },
     module: null,
     metadata: {
-      status:
-        classification === "malformed" || classification === "not-available"
-          ? "malformed"
-          : "absent",
+      status: classification === "malformed" ? "malformed" : "absent",
       version: null,
       table_row_counts: {},
     },
@@ -75,7 +73,7 @@ const emptyInspection = (
       ready_to_run: false,
       mixed_mode_or_native_header: false,
     },
-    coverage: { state: classification, issues },
+    coverage: { state: "unavailable", issues },
     limitations: [
       "No CLI data was admitted; native boundary declarations are unavailable.",
       "Static inspection does not load or execute target code, so native export resolution is not performed.",