Engine: native preset L (rrlite unfolded input, expansion and reconstruction stages)

packaging/RELEASE_NOTES.md

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 # Unreleased
 
+- Native engine, preset L (DLSS 4.5, render preset 12): the engine now runs L ([Engine] Enabled, models in `engine/l` and `engine/l-ldr`, built by `engine/compile_m.py` from a capture of preset L; `scripts/install_d4r_runtime.sh` stages `D4R_ENGINE_MODEL_L` / `D4R_ENGINE_MODEL_L_LDR`). Every stage, `d4r-m` on captured frames and the D3D12 harness are byte-identical to the CUDA backend running NVIDIA's translated kernels, apart from isolated single-frame knife edges (96-122 dB). 1280x720 -> 3840x2160 takes 3.8 ms on an RX 9070 XT. Display-resolution motion vectors keep the CUDA backend, as for M. Details: `engine/L_NOTES.md`.
+- Native engine fixes found with L, which also apply to M (rebuild M packages with the current `compile_m.py`): the encoders' patch merge is clamped to ±2π as NVIDIA's kernels do; the automatic exposure is measured on NGX's grid at Ultra Performance (half the render size, at least 256, when the output is more than twice the render size; half the output was used, which changed every value downstream); the downsample's filter weights are exact (glslang rounded them toward zero: 92% of the output values were identical, now all); and the network uses the summation order of NVIDIA's kernels as ZLUDA runs them. M is now byte-identical to that CUDA backend in the harness too, where it measured 36-41 dB.
 - `scripts/check_redistributable.py` refuses NVIDIA's binaries, NGX SDK headers, PTX and code objects, d4r's PTX translations and the engine's model data. `scripts/package_release.sh` runs it on every release before zipping, and `git config core.hooksPath scripts/git-hooks` runs it before each commit.
 - Native engine fixes: the K adapter now passes the game's exposure scale to the exposure shader (it was silently ignored); the HIP network's shared buffers are reused across feature recreation instead of leaking their ROCm mapping (21 → 6 imports over seven K features in the harness); `hipnet.bin` must belong to the preset being created; an M-only game no longer loads the K model; `scripts/install_d4r_runtime.sh` stages `engine/k-ldr` and each model's `hip/` folder.
 - Native engine, preset K: output is now byte-identical to the CUDA reference over an eleven-frame sequence at Quality (1706×960 → 2560×1440, native HIP network, RX 9070 XT), where later frames previously fell to 47–51 dB. The engine now selects NGX's reconstruction table by upscaling ratio instead of using one table for every ratio, and two rounding-order differences in the input and output stages are gone. K models must be rebuilt (`prepare_k.py`, `compile_k.py`); older packages still load and behave as before.