The `aura new` scaffold ships one node, a param-less Identity, so there is
no public example of a build closure consuming a bound param — the F2 gap
the project-environment fieldtest rated its highest-value authoring miss.
This pins the target: the rendered starter lib.rs declares a ParamSpec and
reads p[0] in its build closure, and the starter blueprint binds `factor`
on the project's own node, so `aura run` exercises the bound-param path
with zero hand-editing.
refs #183
Brummel
93a2e2bb60