ENH: compute rocket static margin lazily (#780) - #1135
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Summary
Rocket.static_marginlazily: a dirty flag is set when geometry/mass/surfaces change; the Function is rebuilt (includingset_discrete) only on first access or an explicitevaluate_static_margin()call.add_motorandadd_surfacesinvalidate instead of eagerly rebuilding; public API (rocket.static_marginas a Function) is unchanged.Test plan
test_static_margin_lazy_until_accessed— SM not discretized until accessed after adding a surfacetest_static_margin_rebuilds_after_adding_surface— adding a surface invalidates; access rebuilds oncetests/unit/rocket/test_rocket.py+tests/integration/test_rocket.py(77 passed)