Centralizes game path discovery into a new openwa-config crate.
find_wa_dir() checks OPENWA_WA_PATH env var then falls back to
HKCU\Software\Team17SoftwareLTD\WormsArmageddon (PATH value).
Removes all hardcoded Steam library paths from launcher, test runner,
and scheme_parse integration test.
Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>