Brings mesh-host #224 (issue 1966): newestFPs returns a placed module whose
newest build failed, composedValues writes its refused key at that fingerprint,
takeBuildDone starts the pass on a failed build. Conflict in newestFPs settled
by keeping G's by-entries branch first (design 47 G §421, §628: the node reads
neither the indexer's modules nor the builder's builds; it returns no failed),
and main's failed-build path in the other.
Claude-Session: https://claude.ai/code/session_01NcbgfGKaxw984XyAPfLm4h