fix: harden upload resilience and contracts

lib/types.ts

@@ -15,11 +15,13 @@ export type DriveAction = 'new' | 'replace'
 
 export type FileChange = 'new' | 'changed' | 'unchanged'
 
+export type FileDiffStatus = 'changed' | 'new' | 'deleted'
+
 export type AssetCategory = 'color' | 'diffuse' | 'roughness' | 'normal' | 'metalness' | 'height' | 'opacity' | 'orm' | 'ao' | 'assets'
 
 export interface FileDiff {
   name: string
-  status: 'changed' | 'new' | 'deleted'
+  status: FileDiffStatus
 }
 
 export interface RemoteFile {
@@ -40,11 +42,30 @@ export interface StagingUploadResult {
   filesCount: number
 }
 
+export interface CheckUploadResult {
+  exists: boolean
+  diffs: FileDiff[]
+  warning?: string
+}
+
+export interface DriveUploadResult {
+  success: boolean
+  error?: string
+}
+
+export interface GitUploadResult {
+  success: boolean
+  filename?: string
+  warning?: string
+  error?: string
+}
+
 export interface PreparedGitAssetsResult {
   filesToPush: PushFile[]
   modelFilename: string
   assetSummaries: PreparedAssetSummary[]
   compressed: boolean
+  deliveryMode: GitModelMode
   compressionError?: string
 }