builtins: add fft and ifft via Cooley-Tukey#200
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Signal-processing and frequency-domain analysis are weak spots for any language that lacks a built-in FFT. fft xs returns the complex spectrum as a list of [re, im] pairs, ifft inverts it. Both use iterative Cooley-Tukey, power-of-two only for now with a clear error on non-pow2 input. Opcodes allocated: fft, ifft. Implementation is allocation-light: in-place butterflies on a pre-sized scratch buffer.
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Signal-processing and frequency-domain work are weak spots without a built-in FFT.
Implementation:
Tests: cross-engine regression tests + examples/fft.ilo with -- run: directives.