rework

[jordens]

• dsp-process: docs, doctests
• dsp-process: specialized Buffer impls, TryDecimator, harden, optimize
• dsp-process: add bytemuck based ChunkOutPod
• dsp-process: use specific block traits for transpose/channels
• dsp-process: Downsample/Hold, .map(), Rate, docs
• cic: add modular micro-benchmark
• dsp-process: format
• cic: shuffle perf measurements
• dsp-process: some composition helpers, make some fields private
• fixedpoint: traits, bytemuck
• get benchmark ported, fix lints
• atan2: use x to normalize, fixes small-amplitude noise
• atan2: use lut+newton for divi()
• atan2: update benchmark
• process: simplify tests
• atan2: clean up algo
• add xorshift
• cossin: add more metric
• atan2: eek out a few more insns
• atan2: another tweak
• Revert "atan2: another tweak"
• Revert "atan2: eek out a few more insns"
• biquad: docs and tests
• process: rules, docs, hints
• cic: streamline test
• dsp-proces: naming fix: lanes
• complex: redesign, remove log2, change norm_sqr
• biquad: add filter plumbing
• idsp/process: add examples
• process: make bytemuck optional
• sweptsine: align design and api
• complex: use float
• reduce num-complex
• iir: simplify response
• [nfc] cleanup/style
• freqz
• response: doc
• docs, clippy