Explain the Lean lemma `phi_sq_eq` in module `IndisputableMonolith.Constants`. 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 supplied source does not contain module IndisputableMonolith.Constants or declaration phi_sq_eq. It is referenced (e.g. as proof term in phi_is_self_similar) but never defined here. Closely related proved statements appear in other modules.

(1) The missing declaration would assert in plain English that the square of the golden ratio equals the golden ratio plus one. (2) Such an identity encodes the fixed-point property of self-similar scaling under J-cost, which Recognition Science uses to force φ from ledger self-similarity. (3) A typical Lean statement would read theorem phi_sq_eq : phi ^ 2 = phi + 1. (4) Visible references depend on Mathlib real arithmetic and on theorems such as phi_equation. (5) It would not prove uniqueness, forcing from discreteness, or ledger closure; those steps live in separate theorems.

Because the exact declaration is absent, the above is contextual only.