fix(ci): resolve cross-platform test failures

- Sanity check script (check-codex-global-state.sh) now falls back to
  grep -E when ripgrep is not available, fixing the codex-hooks sync
  test on all CI platforms. Patterns converted to POSIX ERE for
  portability.
- Unicode safety test accepts both / and \ path separators so the
  executable-file assertion passes on Windows.
- Gacha test sets PYTHONUTF8=1 so Python uses UTF-8 stdout encoding on
  Windows instead of cp1252, preventing UnicodeEncodeError on box-drawing
  characters.
- Quoted-hook-path test skipped on Windows where NTFS disallows
  double-quote characters in filenames.

tests/scripts/openclaw-persona-forge-gacha.test.js

@@ -30,6 +30,7 @@ function runGacha(pythonBin, arg) {
   return spawnSync(pythonBin, [SCRIPT, arg], {
     encoding: 'utf8',
     maxBuffer: 10 * 1024 * 1024,
+    env: { ...process.env, PYTHONUTF8: '1' },
   });
 }