Update check_test_order.py to handle header/footer split correctly
when infrastructure code is at both start and end of file.
Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>
Checks and fixes test ordering in parser_test.zig to match
upstream zig/lib/std/zig/parser_test.zig.
Usage:
python3 check_test_order.py # check only
python3 check_test_order.py --fix # reorder tests
Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>