ci: make parser smoke test resilient (warn if ESC07.sop missing) #6

	name: CI: Python workflow (imports + parser smoke test)
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	on:
	push:
	branches: [ "main" ]
	pull_request:
	branches: [ "main" ]

	jobs:
	ci:
	runs-on: ubuntu-latest

	steps:
	- name: Checkout repo
	uses: actions/checkout@v4

	- name: Set up Python
	uses: actions/setup-python@v5
	with:
	python-version: "3.12"

	- name: Install dependencies
	run: \|
	python -m pip install --upgrade pip
	if [ -f requirements.txt ]; then pip install -r requirements.txt; fi

	- name: Import smoke test
	run: \|
	python - <<'PY'
	import sys
	import matplotlib
	try:
	import networkx
	print("OK networkx", networkx.__version__)
	except Exception as e:
	print("networkx not installed:", e)
	print("OK matplotlib", matplotlib.__version__)
	PY

	- name: Parser smoke test (ESC07.sop)
	run: \|
	python - <<'PY'
	import os, sys
	from instance_parser import parse_sop_file

	p = os.path.join("sop_instances", "ESC07.sop")
	if not os.path.exists(p):
	print("::warning :: Missing sop_instances/ESC07.sop — skipping parser test (will not fail CI).")
	sys.exit(0)

	try:
	nodes, matrix, precedence = parse_sop_file(p)
	assert len(nodes) == len(matrix), "nodes and matrix size mismatch"
	except Exception as e:
	print(f"::error :: Parser failed: {e}")
	sys.exit(1)

	print(f"OK parser: {len(nodes)} nodes, {len(precedence)} precedence rules")
	PY

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