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a11y screenshot: crash-safe layered alpha restore guard

Crash-safe restore of layered window alpha during a11y screenshot suppression -- prevents windows staying invisible after taskkill/AccessViolation/SIGKILL of the screenshot process

user/developer

Steps

  1. PROBLEM SuppressBlockingWindows in Screensho...
  2. FIX ScreenshotCommand.AlphaRecovery.cs adds...
  3. HOOKS Console.CancelKeyPress + AppDomain.Pro...
  4. RECOVERY RecoverOrphanedAlpha() runs in Prog...
  5. INVARIANT persist BEFORE alpha=0; recovery i...
  6. ENTRY POINTS AlphaRecord, AlphaClearPending,...
  7. PROBLEM: SuppressBlockingWindows in csharp/s...
  8. PERSIST: ScreenshotCommand.AlphaRecovery.cs...
  9. GRACEFUL HOOKS: First AlphaRecord() call als...
  10. STARTUP RECOVERY: Program.Dispatch.cs Run()...
  11. CLEAR ON SUCCESS: RestoreBlockingWindows tai...
  12. EVIDENCE: D:/GitHub/WKAppBot/.wkappbot/evide...
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