nodeComponents() split a DAG into weakly-connected components via deps
edges, but post #2476/#2450 every agent's rebuild subgraph hangs off a
shared MetaLock node via AfterOk, so the whole meta-update cascade is one
connected component and rendered as a single wall-of-chips line.
Add a second pass (splitFanOut) that further splits a component's
topo-ordered nodes on out-degree>1 points: a node with more than one
direct dependent renders as its own one-node line, and each dependent
becomes the root of an independent line. Purely deps-structure-driven,
same as the existing WCC split - no agent-field grouping involved. A
component with no fan-out (the common single-agent case) is unaffected.
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