PySys_AddAuditHook: check initialized, not core_initialized

The docs say audit hooks are notified "after runtime initialization".
With the flag move, initialized=0 throughout init (including site
import), so hooks are correctly not invoked during any init phase.
Using core_initialized would have expanded the invocation window
beyond the original behavior.

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

Author: gpshead

Python/sysmodule.c

@@ -33,7 +33,7 @@ Data members:
 #include "pycore_pymath.h"        // _PY_SHORT_FLOAT_REPR
 #include "pycore_pymem.h"         // _PyMem_DefaultRawFree()
 #include "pycore_pystate.h"       // _PyThreadState_GET()
-#include "pycore_runtime.h"       // _PyRuntimeState_GetCoreInitialized()
+#include "pycore_runtime.h"       // _PyRuntimeState_GetInitialized()
 #include "pycore_pystats.h"       // _Py_PrintSpecializationStats()
 #include "pycore_structseq.h"     // _PyStructSequence_InitBuiltinWithFlags()
 #include "pycore_sysmodule.h"     // export _PySys_GetSizeOf()
@@ -472,7 +472,7 @@ PySys_AddAuditHook(Py_AuditHookFunction hook, void *userData)
        PySys_AddAuditHook() can be called before Python is initialized. */
     _PyRuntimeState *runtime = &_PyRuntime;
     PyThreadState *tstate;
-    if (_PyRuntimeState_GetCoreInitialized(runtime)) {
+    if (_PyRuntimeState_GetInitialized(runtime)) {
         tstate = _PyThreadState_GET();
     }
     else {