monkey-w1n5t0n 8a19e5b52c refactor(ml)!: P2.1 storage-policy split — MLPCore<Storage>, fixed + dynamic models ...

Algorithms (forward, backprop/SGD, init, move_weights, diagnostics) now live
once in MLPCore<Storage> (nisps/ml/mlp.hpp). Storage models:

- FixedStorage (storage.hpp): template-sized std::array, zero heap. The
  classic MLP<NIn,H1,H2,H3,NOut,...> is an alias preserving kInput/kHidden*/
  kOutput/kNumLayers/weight_count() constexpr — firmware + bindings + modes
  compile unchanged.
- DynamicStorage (dynamic_storage.hpp): runtime dims, ONE arena allocation
  at construction, nothing per-call. #error under NISPS_TARGET_EMBEDDED
  (new macro in core/perf.hpp); sole lint-cpp.sh heap-allowlist entry, plus
  a lint check that fails if the #error guard disappears.

Verification:
- new ctest test_mlp_storage_parity: fixed↔dynamic BIT-identical across
  init/draw/inference/train(FIFO)/move_weights(pin mask)/eval_loss/
  layer_stats/set_weights/infer_batch/reset; invalid+moved-from inert
- golden ML vectors (pre-refactor constants) pass → bit-stable refactor
- native↔WASM parity PASS, max delta unchanged (2.4e-7)
- chokepoint B compile: PAFSynth .text 122324→122692 (+0.30%, ±1% budget);
  RAM +416B (eval scratch)
- fix: firmware-common.sh used bare 'python' (absent here) → ${PYTHON:-python3}

Part of one-core-engine-refactor P2. nisps_ml_create ABI untouched (P2.2 is
an operator stop-point).

2026-07-13 23:47:03 +02:00

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