Rosenblatt: project scaffold for RK3588 NPU on mainline

Codename: Frank Rosenblatt — Mark I Perceptron 1958, the first
hardware neural network.  This project lights up the RK3588 NPU on
mainline Linux so the OSS world finally owns the silicon-side of
inference on that chip.

Phase-1 scope: small LLM running CPU + NPU mix on boltzmann (Rock 5
ITX+).  Backend: llama.cpp with a new rknpu ggml backend offloading
INT8 GEMM (attention + FFN matmuls) to the NPU's tile-MAC array while
leaving dequant / RoPE / softmax / sampling / embedding on A76 NEON.

Target model: qwen2.5-1.5B-instruct Q4_K_M GGUF.

Scaffold layout: README.md (frame + 9+1-phase plan), TODO.md (rolling
punch-list), docs/{npu-mainline-status,architecture}.md, kernel/ for
DT bindings + driver tweaks, userspace/{npu-probe,llm-runtime}/,
fleet/boltzmann.yaml.

Next: Phase-1 substrate audit — fill the TBDs in docs/npu-mainline-status.md
with the actual state of Tomeu Vizoso's rknpu / DRM-accel work on
the boltzmann-running kernel.

userspace/npu-probe/README.md

@@ -0,0 +1,33 @@
+# npu-probe
+
+Smallest-possible userspace binary that:
+1. Opens the NPU device (path TBD per Phase-1 audit)
+2. Allocates two INT8 input tensors (64×64) + one output (64×64)
+3. Submits a matmul via the uAPI in use (Tomeu's accel ioctl OR our own
+   shim around vendor MMIO if accel-mainline isn't ready)
+4. Waits for completion (DMA fence or polled completion register)
+5. Reads back the output
+6. Compares to a CPU INT8 matmul reference; reports pass/fail
+
+**Phase-1 deliverable.** Until this works, nothing else in this repo
+can be exercised against real silicon.
+
+## Build
+
+_(filled when Phase-1 audit picks the uAPI shape — `meson` or `cmake`,
+no autotools)_
+
+## Run
+
+```
+./npu-probe                      # default 64×64 INT8 matmul
+./npu-probe --shape 128,128,128  # M,N,K override
+./npu-probe --device /dev/accel/accel0    # override device path
+./npu-probe --golden golden_64x64.bin     # provide expected output for diff
+```
+
+## Why C, not Python
+
+Direct ioctl + dmabuf + mmap. Python wrapper layer would obscure the
+exact syscall sequence we need to understand. Once npu-probe works,
+a Python binding for benchmark scripts is fine.