provisioner_compose took 2.6-13.6 s per node with nothing changed, CPU
bound. The node is now composed at its wanted and its newest builds over
one read (frombus.PlansHeldTwice, whose composer resolves each machine
once), its own plans, provisions and refusals and the providers' entries
are read from the watched copy, its own writes taken in at once, and a
provider's manifest once by digest: no read by key per composition is
left. The result says where the time went, phase by phase, and a slow
composition that changed nothing says it in the log.
BenchmarkComposeNode times it over a mesh captured with the read tools
(MESH_COMPOSE_CAPTURE): novox 11.7 s to 0.49 s, ace 0.49 s, g14 and
shanks 0.39 s; plans and provisions identical to before over nine
compositions of the four nodes.
Needs mesh-sdk feat/compose-once (5d26c65); go.mod still pins the old
mesh-sdk until the group pins its head.
Claude-Session: https://claude.ai/code/session_01NcbgfJ9Gum47zkFKWRaovL
jschoubben
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