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Add a new example demonstrating the full herkos pipeline with a numerically substantive algorithm: - fft.c: radix-2 Cooley-Tukey DIT FFT (no libc/libm) - Twiddle factors via Taylor series + recurrence - Bit-reversal permutation - In-place butterfly passes (12 stages) - Magnitude via __builtin_sqrtf (→ Wasm f32.sqrt) - Compilation: clang to wasm32-unknown-unknown (1.1 KB binary) - Transpilation: herkos generates memory-safe Rust (no unsafe) - Integration: Rust host writes signals, reads spectrum Key features: - Zero unsafe code in transpiled output - Memory isolation enforced by type system - Three test signals: 1000 Hz, 440+2000 Hz, 3520+880 Hz - Performance: ~420µs per FFT on modern CPU - Accuracy: peak frequencies correct to ~1 Hz (bin resolution) Suitable for release as a showcase example. Co-Authored-By: Claude Haiku 4.5 <noreply@anthropic.com>
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