fix(test): preserve sandbox refusal provenance

scripts/gate-history.mjs

@@ -142,7 +142,7 @@ export async function replayCommit(root, commit) {
       if (install.status !== 0 || install.error || install.signal) {
         return {
           ...install,
-          stderr: `historical frozen dependency install failed: ${install.stderr || install.stdout || ''}`,
+          stderr: `historical frozen dependency install failed: ${install.error?.message || install.stderr || install.stdout || ''}`,
         };
       }
       const authoritativeChanges = await authoritativeTreeChanges(

scripts/gate-history.test.mjs

@@ -17,10 +17,11 @@ const fixtureRoot = path.join(process.cwd(), '.mosaic-test-work', `gate-history-
 function sandboxUnavailable(result) {
   const detail = `${result.stdout ?? ''}${result.stderr ?? ''}${result.error?.message ?? ''}`;
   const bubblewrapSpawnDenied =
-    result.error?.code === 'EPERM' && /spawnSync bwrap/i.test(result.error?.message ?? '');
+    ['EPERM', 'EACCES', 'ENOENT'].includes(result.error?.code) &&
+    /spawnSync bwrap/i.test(result.error?.message ?? '');
   if (
     !bubblewrapSpawnDenied &&
-    !/bwrap.*(?:EPERM|Operation not permitted|Creating new namespace failed)/i.test(detail)
+    !/bwrap:.*(?:Operation not permitted|Creating new namespace failed)/i.test(detail)
   ) {
     return false;
   }
@@ -50,13 +51,15 @@ test.after(async () => {
 });
 
 test('sandbox refusal classification requires Bubblewrap provenance', () => {
-  assert.equal(
-    sandboxUnavailable({
-      status: null,
-      error: { code: 'EPERM', message: 'spawnSync bwrap EPERM' },
-    }),
-    true,
-  );
+  for (const code of ['EPERM', 'EACCES', 'ENOENT']) {
+    assert.equal(
+      sandboxUnavailable({
+        status: null,
+        error: { code, message: `spawnSync bwrap ${code}` },
+      }),
+      true,
+    );
+  }
   assert.equal(
     sandboxUnavailable({
       status: null,
@@ -64,6 +67,10 @@ test('sandbox refusal classification requires Bubblewrap provenance', () => {
     }),
     false,
   );
+  assert.equal(
+    sandboxUnavailable({ status: 1, stderr: 'historical verifier said bwrap ENOENT' }),
+    false,
+  );
 });
 
 test('prospective history reads each commit own manifest rather than the current tree', async () => {