Fix silent uninstall cleanup

[tsuchim]

Summary

• fix silent uninstall when setup runs from the installed version directory
• remove uninstall registration and Start Menu shortcut before install-root cleanup
• add v0.3.5 release draft for the winget readiness fix

Validation

• scripts/check-workflow-release-state.ps1
• dotnet restore PriorityGear.slnx
• dotnet build PriorityGear.slnx --configuration Release --no-restore
• dotnet test PriorityGear.slnx --configuration Release --no-build
• scripts/build-verification-installer.ps1
• scripts/package-release.ps1 -TagName v0.3.5
• scripts/inspect-release-artifacts.ps1 -TagName v0.3.5
• elevated v0.3.5 candidate direct setup install/uninstall lifecycle passed

[Copilot]

Pull request overview

This PR fixes a silent uninstall edge case where the setup executable is launched from within the installed Program Files directory, ensuring uninstall cleanup can still complete and documenting the v0.3.5 release draft for WinGet lifecycle readiness.

Changes:

• Reorders uninstall cleanup to remove uninstall registration and Start Menu shortcut before removing installed program files.
• Adds delayed install-root deletion logic when setup is executing from inside the install directory.
• Adds v0.3.5 release draft notes describing the installer fix and distribution boundary.

Reviewed changes

Copilot reviewed 3 out of 3 changed files in this pull request and generated 2 comments.

File	Description
tests/PriorityGear.Setup.Tests/SetupPlanningTests.cs	Adds tests that assert uninstall cleanup ordering and the presence of delayed-delete scheduling strings.
src/PriorityGear.Setup/Program.cs	Introduces RemoveInstallDirectory and schedules post-exit deletion when uninstall runs from the install root.
docs/release-drafts/v0.3.5.md	Adds release draft documenting the installer fix and scope/distribution notes.