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Johnathan Corgan
2b009196b5
Bring the proto tree closer to a std+alloc-only posture, behavior unchanged on every decision path: - Sweep the remaining std::fmt and std::collections imports over to core::fmt and alloc::collections across the wire codecs and their tests. Subsystem files that shadow the core name with a child core module use the leading-colon ::core::fmt form. Imports only. - Replace the two f64::powi calls (bloom false-positive-rate, FMP backoff timer) with a shared core-only square-and-multiply helper in proto/math, bit-identical to std::powi (a guard test pins this against every exponent the codecs reach), and route the diagnostic estimated-count natural log through libm::log. The FPR reject decision and the backoff timer are bit-for-bit unchanged; only the debug-only count estimate may differ by at most one ULP.