Add [#1118]-tagged info logs to originFile path selection

Diagnosing this failure mode requires a way to tell PHImageManager and
walker outputs apart on-device. Add three info-level log lines, all
prefixed `[#1118]` so they can be filtered together:

- `fetchOriginImageFile:` — one line per call recording the primary
  resource type, UTI, and whether the request will go through
  PHImageManager first or the walker first. Makes the routing decision
  visible without stepping through the code.
- `fallbackFetchImageDataFor:` `dataHandler` — logs degraded intermediate
  drops (with byte count so a "large degraded" case is distinguishable
  from a "tiny thumbnail" one), cancellation, and the final delivered
  byte count with the destination path.
- `writeImageResourceToFile:` — logs the delivered file size, resource
  UTI, and resource type on the walker's success path.

Together, `grep [#1118]` on `xcrun devicectl log` (or Xcode Console) now
yields a decision → delivery trail for every originFile call, so a
reporter can attach the log excerpt when the returned bytes look smaller
than expected — no debug build needed.

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

Author: AlexV525

darwin/photo_manager/Sources/photo_manager/core/PMManager.m

@@ -1442,6 +1442,13 @@ - (void)fetchOriginImageFile:(PHAsset *)asset resultHandler:(PMResultHandler *)h
         return;
     }
     [self notifyProgress:progressHandler progress:0 state:PMProgressStatePrepare];
+    PHAssetResource *primary = candidates.firstObject;
+    BOOL viaImageManager = [self canFetchOriginViaImageManager:primary];
+    [[PMLogUtils sharedInstance] info:[NSString stringWithFormat:
+        @"[#1118] fetchOriginImageFile id=%@ primary.type=%d uti=%@ → %@",
+        asset.localIdentifier, (int)primary.type,
+        primary.uniformTypeIdentifier ?: @"(nil)",
+        viaImageManager ? @"PHImageManager first" : @"walker first"]];
     __weak typeof(self) weakSelf = self;
     // Prefer PHImageManager.requestImageDataAndOrientation with
     // deliveryMode=HighQualityFormat first: PHAssetResourceRequestOptions has
@@ -1496,7 +1503,7 @@ - (void)fetchOriginImageFile:(PHAsset *)asset resultHandler:(PMResultHandler *)h
         }];
     };
 
-    if (![self canFetchOriginViaImageManager:candidates.firstObject]) {
+    if (!viaImageManager) {
         runWalker(nil);
         return;
     }
@@ -1597,6 +1604,12 @@ - (void)writeImageResourceToFile:(PHAssetResource *)imageResource
             // Walker retries with the next candidate; don't emit Failed here.
             block(nil, error);
         } else {
+            long long size = [(NSNumber *)[[NSFileManager.defaultManager attributesOfItemAtPath:path error:nil]
+                              objectForKey:NSFileSize] longLongValue];
+            [[PMLogUtils sharedInstance] info:[NSString stringWithFormat:
+                @"[#1118] writeDataForAssetResource delivered %lld bytes (uti=%@ type=%d) → %@",
+                size, imageResource.uniformTypeIdentifier ?: @"(nil)",
+                (int)imageResource.type, path]];
             [strongSelf notifySuccess:progressHandler];
             block(path, nil);
         }
@@ -1650,9 +1663,13 @@ - (void)fallbackFetchImageDataFor:(PHAsset *)asset
         // Ignore it and wait for the definitive callback — writing degraded
         // bytes to disk would reproduce the very symptom of #1118.
         if ([info[PHImageResultIsDegradedKey] boolValue]) {
+            [[PMLogUtils sharedInstance] info:[NSString stringWithFormat:
+                @"[#1118] PHImageManager degraded intermediate dropped, data=%lu",
+                (unsigned long)imageData.length]];
             return;
         }
         if ([info[PHImageCancelledKey] boolValue]) {
+            [[PMLogUtils sharedInstance] info:@"[#1118] PHImageManager cancelled"];
             block(nil, [NSError errorWithDomain:@"PMPhotoManager" code:-2 userInfo:@{
                 NSLocalizedDescriptionKey: @"PHImageManager request was cancelled."
             }]);
@@ -1674,6 +1691,7 @@ - (void)fallbackFetchImageDataFor:(PHAsset *)asset
         // originals (multi-MB HEIC/JPEG) can otherwise stall UI for tens of
         // milliseconds while writing. Matches the pattern used by
         // `fetchFullSizeImageFile:` below.
+        NSUInteger dataLength = imageData.length;
         dispatch_async(strongSelf->_imageFileProcessingQueue, ^{
             __strong typeof(weakSelf) innerSelf = weakSelf;
             if (!innerSelf) { return; }
@@ -1683,6 +1701,9 @@ - (void)fallbackFetchImageDataFor:(PHAsset *)asset
                 block(nil, writeError);
                 return;
             }
+            [[PMLogUtils sharedInstance] info:[NSString stringWithFormat:
+                @"[#1118] PHImageManager delivered %lu bytes → %@",
+                (unsigned long)dataLength, path]];
             [innerSelf notifySuccess:progressHandler];
             block(path, nil);
         });