docs(vcv): address spec gaps from fresh-eyes review
- Fix licensing: nisps-core is MPL-2.0, VCV SDK is GPLv3
- Fix VCV Rack 2 description: Community Edition is free, Pro is paid
- Add Phase 0: port spread-aware drawWeights/moveWeights to nisps-core C++
- Detail threading model: two MLP instances, atomic swap flag, memory cost
- Add configurable output slew (default 10ms) for post-training crossfade
- Add input signal handling: mono channel 0, hard-clamp out-of-range CV
- Add .nisps file format version field for forward compatibility
- Document dataset capacity (100 max, FIFO forgetting)
- Specify novelty/confidence computation strategy (training thread, cached grid)
- Add open questions: novelty grid scaling, C++20 toolchain, expander protocol
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