Electron 43 Windows executable fails PME real signing

Bug description

The scheduled Storage Explorer 1.46.0 release build fails PME real signing for both Windows x64 and ARM64. StorageExplorer.exe is rejected with SignTool Error: SignedCode::Sign returned 0x800700C1 (ERROR_BAD_EXE_FORMAT).

Evidence

• Scheduled real-signed release build: https://dev.azure.com/devdiv/DevDiv/_build/results?buildId=15106548
• Source branch: rel/1.46.0
• Source commit: 838f1a60311e3d97a977483669277d9c7e821d20
• Build tags: Real signed, PME Signed
• Windows x64 and ARM64 both fail signing StorageExplorer.exe.

The prior test-sign validation build succeeded but is not valid release proof because it was a pull request build using test signing: https://dev.azure.com/devdiv/DevDiv/_build/results?buildId=15101623

The earlier fix PR upgraded @electron/fuses to v2 but did not fix the official PME signing path: https://dev.azure.com/devdiv/DevDiv/_git/StorageExplorer/pullrequest/774218

A canceled manually queued build is explicitly excluded as evidence. Final validation must come from a scheduled real-signed build on rel/1.46.0.

Expected behavior

The packaged Electron 43 Windows executable remains a valid, signable PE after all packaging mutations and succeeds in the scheduled PME real-signing release pipeline.

Start by inspecting the Electron 43 packaging mutations on rel/1.46.0 and the earlier @electron/fuses v2 fix, then review the PME real-signing release pipeline. Done means StorageExplorer.exe remains a valid PE and a scheduled real-signed build succeeds for both Windows x64 and ARM64.