The grants part reads a node's capability readings and the runner that
announced them from the assignment half; the assigner reads both from the
node record it already holds, the digest over all of it.
Builds: design 46 7 §6 (the assignment half carries, for each node, its capability readings, each with the fingerprint of the runner that announced it), design 47 G §194, lead answer A-203 (readings, fingerprint)
Claude-Session: https://claude.ai/code/session_01NcbgfGKaxw984XyAPfLm4h
jschoubben
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