Merge branch 'upstream' into concedo_experimental

# Conflicts:
#	.github/workflows/build-cuda-windows.yml
#	.github/workflows/release.yml
#	app/llama.cpp
#	build-xcframework.sh
#	docs/speculative.md
#	ggml/src/ggml-opencl/ggml-opencl.cpp
#	ggml/src/ggml-opencl/kernels/cvt.cl
#	ggml/src/ggml-webgpu/ggml-webgpu-shader-lib.hpp
#	ggml/src/ggml-webgpu/ggml-webgpu.cpp
#	ggml/src/ggml-webgpu/wgsl-shaders/set_rows.wgsl
#	requirements/requirements-server-bench.txt
#	scripts/server-bench.py
#	tests/test-backend-ops.cpp
#	tests/test-llama-archs.cpp
#	tools/cli/README.md
#	tools/completion/README.md
#	tools/server/README.md

.github/actions/ccache-clear/action.yml

@@ -0,0 +1,22 @@
+name: "ccache-clear"
+description: "Delete all GitHub Actions caches matching a key prefix"
+inputs:
+  key:
+    description: "Cache key prefix to match and delete"
+    required: true
+
+runs:
+  using: "composite"
+  steps:
+    - name: Clear caches
+      shell: bash
+      run: |
+        CACHES=$(gh cache list --key "ccache-${{ inputs.key }}" --json id,key --jq '.[] | "\(.id) \(.key)"' 2>/dev/null)
+        if [ -z "$CACHES" ]; then
+          echo "No caches found with key prefix: ${{ inputs.key }}"
+          exit 0
+        fi
+        while read -r id key; do
+          echo "Deleting cache: $id ($key)"
+          gh cache delete "$id"
+        done <<< "$CACHES"