Explain the Lean def `strainAtRung` in module `IndisputableMonolith.Astrophysics.GravitationalWaveFromJCost`. Write for an educated reader who knows science and programming but may not know Lean. Cover: (1) what the declaration says in plain English, (2) why it matters in Recognition Science, (3) how to read the formal statement, (4) visible dependencies or certificates in the supplied source, and (5) what this declaration does not prove. Cite only declarations present in the supplied Recognition source.

The requested module IndisputableMonolith.Astrophysics.GravitationalWaveFromJCost and the declaration strainAtRung are not present in the supplied slice of the Pith canon.

While the Recognition Science framework natively models gravity—for example, deriving the gravitational constant $G = \varphi^5$ as a curvature extremum and proving that gravity and light share the exact same causal propagation limit (seen in the supplied IndisputableMonolith.Gravity.PropagationSpeed module)—the specific calculation of gravitational wave strain at a given $\varphi$-ladder rung is not included here.

Because the formal declaration is absent, I cannot provide its plain English translation, break down its Lean syntax, audit its dependencies, or explain its specific proof boundaries based on the provided text.