chore: import upstream snapshot with attribution

.github/scripts/install_lmcache_cpu.sh

@@ -0,0 +1,27 @@
+#!/usr/bin/env bash
+# SPDX-License-Identifier: Apache-2.0
+#
+# Install lmcache in editable, CPU-only mode (NO_GPU_EXT=1).
+# Assumes vLLM (and therefore torch) was already installed by
+# install_vllm_cpu.sh, so we use --no-deps to keep that pinned torch
+# in place.
+#
+# Usage:
+#   install_lmcache_cpu.sh           # plain pip
+#   PIP_BIN="uv pip" install_lmcache_cpu.sh
+
+set -euo pipefail
+
+PIP_BIN="${PIP_BIN:-pip}"
+
+export NO_GPU_EXT=1
+export SETUPTOOLS_SCM_PRETEND_VERSION="${SETUPTOOLS_SCM_PRETEND_VERSION:-0.0.0.dev0}"
+
+${PIP_BIN} install --upgrade pip
+${PIP_BIN} install -r requirements/build.txt
+${PIP_BIN} install -r requirements/common.txt
+${PIP_BIN} install -r requirements/cli.txt
+${PIP_BIN} install -e . --no-deps --no-build-isolation
+
+python -c "import lmcache, vllm; \
+print('lmcache:', lmcache.__version__, 'vllm:', vllm.__version__)"