v0.2.1

stable-diffusion-go v0.2.1 — pure-Go binding + prebuilt native libraries.

Built from leejet/stable-diffusion.cpp @ 19bdfe2 (upstream pin: master-685-19bdfe2).

go get github.com/Pendra-Cloud/stable-diffusion-go@v0.2.1 for the
binding; the lib archives attached here match this exact tag. Each archive
contains a self-contained libstable-diffusion (ggml statically linked,
hidden visibility — exports only the sd_* symbols pkg/sd/load.go registers).

CUDA archives require a matching host CUDA runtime; Vulkan archives require
a Vulkan loader/ICD on the host. The Windows archive carries the per-CPU/GPU
(avx2/avx512/avx/noavx/vulkan/cuda12) subdir tree the binding selects from.

Problem

The v0.2.0 CUDA libstable-diffusion.so carries a hard libnccl.so.2
NEEDED dependency (v0.1.15 did not). On a clean CUDA host without the
separate libnccl2 package installed, the library fails to dlopen — so a
downstream consumer's CUDA image backend can't load at all. Reproduced on an
RTX A4000 / CUDA 13 box: the lib only loaded after apt install libnccl2.

Root cause

ggml's GGML_CUDA_NCCL option defaults ON (ggml/CMakeLists.txt). The
build runs in nvidia/cuda:13.0.0-devel, which ships NCCL, so cmake's
find_package(NCCL) succeeds and links it into ggml-cuda. Because ggml is
statically linked into libstable-diffusion.so (SD_BUILD_SHARED_GGML_LIB=OFF),
that propagates as a NEEDED libnccl.so.2 entry.

NCCL is multi-GPU collective communication only (all-reduce across GPUs).
Single-GPU / single-context image (and video) generation never invokes it, so
it is safe to drop — and dropping it is better than bundling a ~100 MB lib.

Change

• Pass -DGGML_CUDA_NCCL=OFF on the Linux CUDA and Windows cuda12
  build legs.
• Add a fail-closed readelf guard on the Linux CUDA job asserting the
  built lib has no libnccl NEEDED entry, so this can't silently
  regress if an upstream default flips.

The remaining NEEDED CUDA deps (libcudart/libcublas/libcuda) are the
expected "matching host CUDA runtime" the release notes already require.

Verification

• gofmt/go vet/go build/go test ./... all clean (Go untouched;
  exported symbol set unchanged, so check-symbols.sh is unaffected).
• The new readelf guard verifies the rebuilt CUDA lib in CI.
• Confirmed the current v0.2.0 CUDA lib references libnccl.so.2; the cmake
  conditional means GGML_CUDA_NCCL=OFF removes that link path.

Patch-level fix → cuts the next patch release; the Pendra worker will then
re-pin to it.

What's Changed

• ci: add PR Agent review workflow backed by Pendra inference by @tomcrawf90 in #21
• fix(cuda): build without NCCL so the CUDA lib loads without libnccl2 by @tomcrawf90 in #20

Full Changelog: v0.2.0...v0.2.1