Keep Time Machine helper layout source consistent

[dbuskariol]

Summary

• make project.yml embed DeltaTimeMachineHelper in the same Contents/MacOS location used by the signed daemon plist and release bundle
• regenerate the Xcode copy phases from that corrected source specification
• make CI reject reintroduction of the obsolete Contents/Library/LaunchServices layout

Root cause

The notarized 0.4.1 binary uses the correct stable path. This development Mac retained a pre-release Background Task Management record for the old path, producing a launch-constraint violation. The stale record was possible because the checked-in Xcode project had been corrected manually while project.yml still described the old layout.

Verification

• swift test --filter TimeMachineSystemControllerTests (55 passed)
• regenerated Xcode project resolves successfully
• isolated ad-hoc Release build from the regenerated project
• helper exists only at Contents/MacOS/DeltaTimeMachineHelper
• daemon BundleProgram resolves that exact file
• strict deep signature verification passed

The finalized/notarized 0.4.1 candidate was not overwritten.