[build] Add a Bazel build: shared module, standalone CppInterOp pin and wheel-layout parity #4

	# Best-effort, NON-GATING Bazel build. The supported build is setup.py/CMake;
	# this job never blocks a PR (continue-on-error). The build and test steps run
	# for real and surface a regression as a warning, not a false green.
	#
	# The build is standalone: CppInterOp comes from the pinned commit in
	# MODULE.bazel, so no sibling clone is needed. Only LLVM comes from the host.
	name: bazel (best-effort)

	on:
	pull_request:
	branches: [main]
	push:
	branches: [main]

	permissions:
	contents: read

	jobs:
	bazel:
	name: bazel (best-effort) llvm${{ matrix.llvm }}
	runs-on: ubuntu-24.04
	continue-on-error: true
	strategy:
	fail-fast: false
	matrix:
	llvm: ["22"]
	steps:
	- name: Checkout cppjit
	uses: actions/checkout@v7

	- name: Setup LLVM ${{ matrix.llvm }}
	uses: compiler-research/ci-workflows/actions/setup-llvm@main
	with:
	version: ${{ matrix.llvm }}
	os: ubuntu-24.04

	- name: Point LLVM_DIR at the tree root for the @llvm Bazel extension
	run: \|
	# setup-llvm sets LLVM_DIR=<prefix>/lib/cmake/llvm (CMake convention);
	# bazel/llvm.bzl needs the tree root holding bin/llvm-config.
	echo "LLVM_DIR=${GITHUB_WORKSPACE}/install" >> "$GITHUB_ENV"

	- name: bazel build //...
	run: \|
	bazelisk build //... \
	\|\| echo "::warning::bazel build //... failed (best-effort, non-gating)"

	- name: bazel test //...
	run: \|
	bazelisk test //... \
	\|\| echo "::warning::bazel test //... failed (best-effort, non-gating)"

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