Synaptic v2 architecture overhaul

[cazala]

Summary

• replace the legacy mutable runtime with a strict TypeScript workspace and portable model, snapshot, checkpoint, plan, backend, and session contracts
• add Paper, CPU, persistent scalar/SIMD WebAssembly, and WebGPU inference/training backends
• add deterministic shared parameters, cross-backend checkpoint restoration, WebGPU fallback/lifecycle handling, and Synaptic v1 migration
• add a specialized WebGPU Growing Neural CA trainer with a 48-generation BPTT tape, exact identity/Sobel perception, pre/post life masking, per-tensor gradient normalization, Adam, sample-pool persistence, and damage training
• export a versioned artifact consumed directly by Automata and add interactive XOR, MNIST, DSR, learn-to-paint, MNIST-to-CA, and Growing-NCA browser demos
• remove ASM, Babel, Bower, Karma, Webpack, Travis, checked-in bundles, and the old v1 implementation
• add comprehensive architecture, backend, artifact, migration, Growing-NCA, testing, and contribution documentation

Validation

• 66 tests across 15 files
• clean TypeScript and AssemblyScript build
• real hardware WebGPU inference, training, recurrent, shared-parameter, checkpoint-resume, and Growing-NCA shader validation
• Growing-NCA browser smoke test reduces loss and verifies Automata accepts the exported artifact
• live 24×24 training runs four 48-generation samples in roughly 15–22 ms per update on the development machine
• fresh npm ci installs the packed Automata PR build reproducibly
• zero npm audit vulnerabilities

Related

• Automata runtime/artifact support: feat: add Growing Neural Cellular Automata automata#9

Notes

• Wasm remains an explicit backend until specialization benchmarks outperform the CPU path
• unfinished synaptic2 artifacts are intentionally unsupported; migration is v1-only
• ASM is intentionally excluded
• the repository temporarily vendors the npm pack output from Automata PR connected() wrong/misused? #9; replace it with the released package version and remove vendor/ after release

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