fix(picker): pointer-width vtable offsets, COM apartment pairing, unconditional abort budget, and the full failure chain

Review round two on the in-process dialog:

- Vtable slots and out-pointers use koffi.sizeof('void *') instead of a
  hardcoded 8 - win32-ia32 (which Node and koffi both ship) would have read
  method pointers from the wrong address and crashed in-process before any
  fallback could run.
- runFolderDialog pairs every successful (incl. S_FALSE) CoInitializeEx
  with CoUninitialize in the outermost finally, releasing the dialog first;
  a failed init is deliberately unpaired. Pinned across fake-bindings and
  mocked-koffi suites.
- The abort close budget starts unconditionally: a worker hung before the
  showing notice (koffi import or COM init) now ends in terminate instead
  of a dangling promise; WM_CLOSE posting still waits for the thread id.
- A triple miss (dialog + pwsh + 5.1) surfaces an AggregateError carrying
  all three causes - the in-process tier's reason was previously
  unrecoverable from the final PowerShell error.
- The stray '=>{ ' formatter artifacts are normalized to real blocks.

Both stale note claims from the review are fixed: the DPI note's
Consequences no longer claims an ENOENT classification or zero new
dependencies, and the 2026-07-27 picker note's Windows bullet now names
the in-process primary and keeps the PowerShell chain as fallback (both
languages, pairings re-recorded).

packages/host/directory-picker-native/src/native-picker.ts

@@ -72,10 +72,12 @@ export async function pickNativeDirectory(
     // support. Any non-abort failure (koffi unavailable, ancient Windows, COM
     // refusal) falls back to the PowerShell chain below.
     const pickDialog = internals.pickWin32Dialog ?? pickWin32Directory
+    let dialogError: unknown
     try {
       return await pickDialog(signal)
     } catch (error: unknown) {
       rethrowIfAborted(signal, error)
+      dialogError = error
     }
 
     // PowerShell fallback: PowerShell 7 renders the modern IFileDialog folder
@@ -100,14 +102,27 @@ export async function pickNativeDirectory(
       '  [Console]::WriteLine($dialog.SelectedPath)',
       '}',
     ].join('; ')
+    let pwshError: unknown
     try {
       const result = await run('pwsh.exe', ['-NoProfile', '-STA', '-Command', script], signal)
       return outputPath(result.stdout)
     } catch (error: unknown) {
       rethrowIfAborted(signal, error)
+      pwshError = error
+    }
+    try {
+      const result = await run('powershell.exe', ['-NoProfile', '-STA', '-Command', script], signal)
+      return outputPath(result.stdout)
+    } catch (error: unknown) {
+      rethrowIfAborted(signal, error)
+      // Triple miss: every tier failed. Surface all three causes — the
+      // in-process dialog's reason is otherwise unrecoverable from the last
+      // PowerShell error alone.
+      throw new AggregateError(
+        [dialogError, pwshError, error],
+        'native directory picker failed: the in-process dialog and both PowerShell hosts failed',
+      )
     }
-    const result = await run('powershell.exe', ['-NoProfile', '-STA', '-Command', script], signal)
-    return outputPath(result.stdout)
   }
 
   if (platform === 'linux') {