BL8 (8255eb28) replaced buildrun's ToolchainGate, ToolchainSet.Put and ToolchainsBucket by PlacedNodes and ToolchainSet.Set for the builder
(§546, §604); no design line removes the checker's and the indexer's toolchain reads, so the three come back beside them, and
FollowAssignments feeds either.
Builds: design 47 G §492, §604, §546, §472, §574
Claude-Session: https://claude.ai/code/session_01NcbgfGKaxw984XyAPfLm4h