test(backup): use Promise.allSettled for file operations

Convert Promise.all to Promise.allSettled in patch backup tests to
ensure all file creation and backup operations complete even if one
fails. This prevents test pollution and provides better diagnostics.

Author: jdalton

packages/cli/src/utils/manifest/patch-backup.test.mts

@@ -440,12 +440,13 @@ describe('patch-backup', () => {
       )
 
       // Create files
-      await Promise.all(files.map((file, i) => writeFile(file, `content ${i}`)))
+      await Promise.allSettled(files.map((file, i) => writeFile(file, `content ${i}`)))
 
       // Create backups concurrently
-      const results = await Promise.all(
+      const settled = await Promise.allSettled(
         files.map(file => createBackup(uuid, file)),
       )
+      const results = settled.filter(r => r.status === 'fulfilled').map(r => r.value)
 
       // Verify all backups were created
       expect(results).toHaveLength(5)
@@ -471,7 +472,7 @@ describe('patch-backup', () => {
       )
 
       // Create files
-      await Promise.all(files.map((file, i) => writeFile(file, `content ${i}`)))
+      await Promise.allSettled(files.map((file, i) => writeFile(file, `content ${i}`)))
 
       // Create backups sequentially
       for (const file of files) {