Add fileNotExists verification and smoke-all test for keep-ipynb cleanup

- Add `fileNotExists` to verify.ts, mirroring `fileExists` but calling
  `verifyNoPath` instead of `verifyPath`
- Wire `fileNotExists` into smoke-all.test.ts verifyMap handling block
  alongside the existing `fileExists` block
- Add smoke-all test 14359.qmd that verifies the .quarto_ipynb intermediate
  file is cleaned up after render when keep-ipynb defaults to false

Author: cderv

tests/docs/smoke-all/2025/05/21/keep_ipynb_single-file/14359.qmd

@@ -0,0 +1,12 @@
+---
+format: html
+_quarto:
+  tests:
+    html:
+      fileNotExists:
+        outputPath: 14359.quarto_ipynb
+---
+
+```{python}
+1 + 1
+```

tests/smoke/smoke-all.test.ts

@@ -34,6 +34,7 @@ import {
   ensureTypstFileRegexMatches,
   ensureSnapshotMatches,
   fileExists,
+  fileNotExists,
   noErrors,
   noErrorsOrWarnings,
   ensurePptxXpath,
@@ -269,6 +270,22 @@ function resolveTestSpecs(
                 );
               }
             }
+          } else if (key === "fileNotExists") {
+            for (
+              const [path, file] of Object.entries(
+                value as Record<string, string>,
+              )
+            ) {
+              if (path === "outputPath") {
+                verifyFns.push(
+                  fileNotExists(join(dirname(outputFile.outputPath), file)),
+                );
+              } else if (path === "supportPath") {
+                verifyFns.push(
+                  fileNotExists(join(outputFile.supportPath, file)),
+                );
+              }
+            }
           } else if (["ensurePptxLayout", "ensurePptxXpath"].includes(key)) {
             if (Array.isArray(value) && Array.isArray(value[0])) {
               // several slides to check

tests/verify.ts

@@ -235,6 +235,16 @@ export const fileExists = (file: string): Verify => {
   };
 };
 
+export const fileNotExists = (file: string): Verify => {
+  return {
+    name: `File ${file} does not exist`,
+    verify: (_output: ExecuteOutput[]) => {
+      verifyNoPath(file);
+      return Promise.resolve();
+    },
+  };
+};
+
 export const pathDoNotExists = (path: string): Verify => {
   return {
     name: `path ${path} do not exists`,