Guard cam-nisley staging paths

wasm-port/tests/browser/interp_smoke.html

@@ -6536,10 +6536,18 @@
         ].join("\n"),
       );
 
-      const camNisleyDir = await writeInterpRegressionFiles(interp, "cam-nisley", [
+      const camNisleyFiles = [
         "cam.ngc",
         "test.tbl",
-      ]);
+      ];
+      if (camNisleyFiles.length !== 2 || new Set(camNisleyFiles).size !== camNisleyFiles.length) {
+        throw new Error("browser_interp_cam_nisley_fixture_coverage: list drift");
+      }
+      const camNisleyDir = await writeInterpRegressionFiles(interp, "cam-nisley", camNisleyFiles);
+      const camNisleyStagedRelativeFiles = camNisleyFiles.map((file) => `${camNisleyDir}/${file}`.replace("/work/browser-interp/cam-nisley/", ""));
+      if (camNisleyStagedRelativeFiles.join(",") !== camNisleyFiles.join(",")) {
+        throw new Error("browser_interp_cam_nisley_staging_manifest: list drift");
+      }
       interp.writeTextFile(
         `${camNisleyDir}/test.ini`,
         [

wasm-port/tests/wasm/node/verify_interp_wasm.mjs

@@ -1491,7 +1491,21 @@ verifyExpectedOutput(
   ].join("\n"),
 );
 
-const camNisleyDir = writeInterpRegressionFiles("cam-nisley", ["cam.ngc", "test.tbl"]);
+const camNisleyFiles = [
+  "cam.ngc",
+  "test.tbl",
+];
+assert.deepEqual(
+  camNisleyFiles.filter((file) => file.endsWith(".ngc")),
+  interpRegressionNgcFilesRecursive("cam-nisley"),
+  "interp cam-nisley fixture coverage drift",
+);
+const camNisleyDir = writeInterpRegressionFiles("cam-nisley", camNisleyFiles);
+assert.deepEqual(
+  camNisleyFiles.map((file) => `${camNisleyDir}/${file}`),
+  camNisleyFiles.map((file) => `/work/interp/cam-nisley/${file}`),
+  "interp cam-nisley staging manifest drift",
+);
 interp.writeTextFile(
   `${camNisleyDir}/test.ini`,
   [