Gavin pointed out to me that my script to build the Weld distribution was broken, so I've create Weld 1.0.0 SP1 (Service Pack 1) which remedies this. You can now find Weld's sources and binaries in artifacts/weld and the CDI API source, javadoc and binary in artifacts/cdi. Download it from here.
At the same time, Shane and I realized that the signature test definition for the TCK had been generated against a slightly out of date API. So I've posted 1.0.0 SP1 of the TCK here.