docs(testing): rewrite time-mocking helper rule to be language-agnostic

The original phrasing leaned on Lisp terms (let-bind, defvar) that don't
translate to most other languages. Generalize to two named failure modes
(infinite recursion against the mocked primitive, scope-shadowing that
production callers can't see) with examples across Python, Lisp, Go, and
JavaScript so the rule applies regardless of stack.

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