By: Michael Lynch <git@mtlynch.io>
Add max photo megapixels constant Define the photo resolution limit in megapixels and derive the pixel limit from it so error messages and validation share the same source value.
| Time to Start | Worker time | Duration | Time to finish | |
| Config | 2s | 37s | 37s | 40s |
| Eval | 37s | 46s | 46s | 1m24s |
| Build | 43s | 8m27s | 1m09s | 1m52s |
| Suite | 2s | 9m51s | 1m50s | 1m52s |