pub fn resolve_study_solver(cx: &Cx) -> Result<Arc<dyn StudySolver>>Expand description
Resolves an explicit child solver, an active Tensor solver, then the default.
A present but malformed child binding is rejected rather than silently bypassed. EvalFabric sites can therefore override the registry default without changing the solve expression. A TensorSite child selects the registered Tensor solver only while its executor binding is active.