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eb83c85a08
Add a ci-custom.py check that prevents powf() from being introduced into esphome/core/ and base entity platform components (sensor, light, climate, etc.). These files are linked into every build, and powf pulls in __ieee754_powf (~2.3KB flash). Existing legitimate uses of powf with non-integer exponents (gamma correction in helpers.cpp) are excluded. New uses can opt out with // NOLINT if truly necessary.
