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ci: render the real WASM viewer on Linux and fail on a blank canvas #2

	name: Linux x86 Wheel Smoke

	# The Linux half of the "real WASM viewer renders" check (#247).
	#
	# The wheel smoke installs the built wheel into a fresh venv and renders a
	# compiled sketch in the shipped WebKitGTK viewer, under Xvfb with software GL.
	# Until this lane existed it ran only on macOS ARM (macos-arm-build.yml), so the
	# Linux viewer path — where WebGL2 is unavailable on OffscreenCanvas and frames
	# are drawn on the main thread instead — was covered by nothing, which is how
	# #247 reached a release branch and could only be found by hand.
	#
	# ci/check_render.py is what makes this a render check rather than a launch
	# check: it decodes the screenshot and requires lit pixels, so a viewer that
	# loads and draws nothing fails here.

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

	# One live run per workflow per ref: a new push to a branch or PR cancels the
	# superseded run instead of queuing behind it in the shared account-wide runner
	# pool. Runs on main get a unique group, so they are never cancelled or coalesced.
	concurrency:
	group: ${{ github.workflow }}-${{ github.ref == 'refs/heads/main' && github.run_id \|\| github.ref }}
	cancel-in-progress: ${{ github.ref != 'refs/heads/main' }}

	jobs:
	call:
	uses: ./.github/workflows/_build.yml
	with:
	runs-on: ubuntu-24.04
	wheel-smoke: true