fix memory_persistent double forwarding

[erichanwang]

fixes #1638

changes:

• call preventDefault() after every explicit writeQuestions / writeAnswers forward in memory_persistent
• assert the lane is claimed in the existing lifecycle tests

verification:

• git diff --check
• PYTHONPATH=nodes/src .venv/bin/python - <<PY ... pytest.main(["nodes/test/memory_persistent/test_node.py", "-q"]) ... PY -> 87 passed
• pre-commit hook: gitleaks, ruff check, ruff format --check

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