The manifest gains the file resource toolchain-wait (content ${config:toolchain-wait-minutes}) and names its path in
MESH_BUILDER_TOOLCHAIN_WAIT_FILE; main.go's toolchainWaitOf reads it.
Builds: design 47 G §672, A-71 (G-20)
Claude-Session: https://claude.ai/code/session_01NcbgfGKaxw984XyAPfLm4h