Document CI validation flag 0x20 and add kernel probe

tests/run-ci-probe-tests.py

@@ -0,0 +1,20 @@
+"""Test the actual kernel probe body with mock CI; run in an x64 VS dev shell."""
+from pathlib import Path
+import re
+import subprocess
+import tempfile
+
+tests = Path(__file__).resolve().parent
+header = (tests.parent / 'include/Domito.MinCrypt.h').read_text(encoding='utf-8-sig')
+names = ['MINCRYPT_MAX_HASH_LENGTH', 'DOMITO_CI_VALIDATE_FLAG_BROADEN_ROOT_ACCEPTANCE']
+constants = '\n'.join(re.search(r'^#define\s+' + name + r'\s+[^\r\n]+', header, re.M)[0]
+                      for name in names)
+with tempfile.TemporaryDirectory(prefix='domito-ci-probe-') as temp:
+    build = Path(temp)
+    (build / 'ci-probe-constants.inc').write_text(constants + '\n', encoding='utf-8')
+    exe = build / 'ci-probe-tests.exe'
+    subprocess.run(['cl', '/nologo', '/EHsc', '/W4', '/WX', '/std:c++17',
+                    '/I' + str(build), str(tests / 'ci-file-object-probe-tests.cpp'),
+                    '/Fe' + str(exe), '/Fo' + str(build / 'ci-probe-tests.obj')],
+                   cwd=build, check=True)
+    subprocess.run([str(exe)], cwd=build, check=True)