Fix WiX authoring errors blocking Windows MSI release job

[Copilot]

Build (Windows MSI) failed in release workflows due to WiX ICE validation errors (ICE80, ICE18, ICE77). This PR updates MSI authoring so the installer compiles cleanly on the Windows release pipeline.

• Align components with 64-bit install target

  • Marked installer components under ProgramFiles64Folder as 64-bit via Win64="yes":
    • MeleysExecutable
    • MeleysConfig
    • MeleysPath

• Satisfy directory keypath validation

  • Added <CreateFolder /> to MeleysPath so the INSTALLFOLDER directory/component pair is represented in CreateFolders (resolves ICE18).

• Correct deferred custom action sequencing

  • Moved RegisterAgents from After="InstallFinalize" to After="InstallFiles" to keep deferred in-script execution inside the valid InstallExecuteSequence window (resolves ICE77).

<Component Id="MeleysPath" ... Win64="yes">
  <CreateFolder />
  <Environment Id="MeleysPathEnv" Name="PATH" Value="[INSTALLFOLDER]" ... />
</Component>

<InstallExecuteSequence>
  <Custom Action="RegisterAgents" After="InstallFiles">NOT REMOVE</Custom>
</InstallExecuteSequence>

[Copilot]

Pull request overview

This PR updates the WiX MSI authoring to resolve Windows release pipeline failures caused by ICE validation errors, aligning the installer with an x64 per-machine install and correcting custom action sequencing.

Changes:

• Marked INSTALLFOLDER components as 64-bit (Win64="yes") to match ProgramFiles64Folder / Platform="x64" (ICE80).
• Added <CreateFolder /> to the INSTALLFOLDER PATH component to satisfy directory keypath/CreateFolders validation (ICE18).
• Moved the deferred RegisterAgents custom action earlier in the execute sequence to avoid invalid deferred scheduling placement (ICE77).

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