buildrun gains AssignerHolder, AssignmentsOf and SleepFor (moved from the builder's program, which uses them), so
the builder and the checker follow the holder's first-view tool, views family and state alike; the checker's
manifest consumes the seat's views assignments and reads its assignments state, its composition reads the
picture once followed. The assigner's callers list for the first view gains the checker.
Builds: design 47 G A-82, A-119, A-126, A-131
Claude-Session: https://claude.ai/code/session_01NcbgfGKaxw984XyAPfLm4h
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
The builder agrees a language's toolchain from the three build seats'
toolchain-reported, kept in its state toolchains-heard (read back at its start),
forgets a node's on the node-engine seat's running with no fingerprint (stopped)
and never on a placement, says toolchain-agreed with its digests list only when
the agreed version changes; builder_toolchains and builder_toolchains_drop;
the manifest's reads of the build modules' toolchains are gone. The gate over
the assignments is now PlacedNodes, which only counts nodes.
Builds: design 47 G §492, §604, §546, §472, §574
Claude-Session: https://claude.ai/code/session_01JG73KEq4zoDfM9WtYpcQgZ
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