I have exactly the same log entries when trying to run LR manually on MacOS.
6/18/14 7:32:17.598 PM Adobe Photoshop Lightroom 5[891]: Cannot add package named WFCoreTests
Looked in /Applications/Adobe Photoshop Lightroom 5.app/Contents/Frameworks/WichitaFoundation.agtoolkit/Versions/A/Frameworks/WFCoreTests.f ramework, /Applications/Adobe Photoshop Lightroom 5.app/WFCoreTests.framework, /Applications/Adobe Photoshop Lightroom 5.app/Contents/Frameworks/WFCoreTests.framework, /Applications/Adobe Photoshop Lightroom 5.app/Contents/Frameworks/WichitaFoundation.agtoolkit/Versions/A/Frameworks/WFCoreTests.a gtoolkit, /Applications/Adobe Photoshop Lightroom 5.app/WFCoreTests.agtoolkit, /Applications/Adobe Photoshop Lightroom 5.app/Contents/Frameworks/WFCoreTests.agtoolkit
!! Did you remember to add a copy frameworks step to your project?
and so on.
What's worse is when I manually install 5.5 upgrade, it asks me for serial number, which I don't have since I am on CC subscription for PS and LR.
I looked at the package of Frameworks and there's a WFCore, but not WFCoreTest. A wild guess - are you guys linking to a DEV version of the toolkit instead of the release version or explicitly linking to tests???