chore: remove legacy blender compression path

lib/upload-staging.ts

@@ -1,6 +1,6 @@
 import { randomUUID } from 'crypto'
 import { dirname, join } from 'path'
-import { mkdir, readdir, readFile, rm, stat, writeFile } from 'fs/promises'
+import { mkdir, readdir, readFile, rm, writeFile } from 'fs/promises'
 import { existsSync } from 'fs'
 import { TMP_DIR } from '@/lib/constants'
 import { prepareGitAssets } from '@/lib/prepare-git-assets'
@@ -203,12 +203,3 @@ export async function readStagedOriginalFiles(stagingId: string): Promise<{ fold
 export async function cleanupStagingUpload(stagingId: string) {
   await rm(getStageDir(stagingId), { recursive: true, force: true })
 }
-
-export async function stagingExists(stagingId: string): Promise<boolean> {
-  try {
-    const info = await stat(getStageDir(stagingId))
-    return info.isDirectory()
-  } catch {
-    return false
-  }
-}