bf-95tx wants a single demonstrable verification that node positions flow
through every runtime stage the position-propagation work touched. bf-69ym
locked in simulator→fleet-registry; bf-u7ds locked in simulator→fusion. This
adds the missing end-to-end lock-in that ties both together in one run.
TestPositionPropagation_FullPipeline wires the production chain behind the
SimulatorHandler (handler → bridge.SyncToRegistry → adapter → fleet.Registry
SQLite, with adapter forwardPos → fleet.Manager.ForwardNodePosition → sink →
fusion.Engine.SetNodePosition), posts one node with an explicit position,
then reads that SAME position back from all three stages and asserts they
agree — at both AddNode and UpdateNode. A pipelineStages helper logs each
stage's value so `go test -v` visibly traces the value's path:
[create] position propagation simulator={1.5 2.5 1} registry={1.5 2.5 1} fusion={1.5 2.5 1}
[update] position propagation simulator={3.5 4.5 2} registry={3.5 4.5 2} fusion={3.5 4.5 2}
The update leg also asserts no stage still holds the stale pre-update value
and that a single node stays a single node at every stage (no orphan/dup).
Co-Authored-By: Claude <noreply@anthropic.com>
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