The local narrowing of mesh-build-go and mesh-build-node moves into mesh-sdk (feat/r4e-sdk
d1af87a), with its tests; each module keeps its fetch-level test on real git. The three
build modules are pinned to d1af87a.
Kept (keys, steps, each read by another module today) is said with stdio.Keeps before the
module serves; announcetest.Check holds the announcement equal to the code. Pinned to
mesh-sdk feat/r4e-sdk 9cb4d59. The manifest test's call of the deleted
StateReadsNothingDeclares still has to go (the edit is waiting on the operator's permission).