Record native XYZAC oracle blocker

scripts/run_xyzac_native_tick_trace.py

@@ -223,6 +223,10 @@ def run(duration: float) -> dict[str, Any]:
 
     source_bytes = PROGRAM.read_bytes()
     trace_hash = sha256_bytes(canonical(rows).encode())
+    python_module = getattr(linuxcnc, "__file__", None)
+    source_python_module = str(ROOT / "linuxcnc/lib/python/linuxcnc.so")
+    if python_module != source_python_module:
+        errors.append("NATIVE_PYTHON_MODULE_MISMATCH")
     status = "verified" if rows and not errors else "blocked"
     return {
         "schema": SCHEMA,
@@ -231,7 +235,7 @@ def run(duration: float) -> dict[str, Any]:
         "launcher": command,
         "native_axis_window": window,
         "program": {"path": PROGRAM.relative_to(ROOT).as_posix(), "sha256": sha256_bytes(source_bytes)},
-        "native_linuxcnc": {"python_module": getattr(linuxcnc, "__file__", None), "display": environment["DISPLAY"]},
+        "native_linuxcnc": {"python_module": python_module, "expected_source_python_module": source_python_module, "display": environment["DISPLAY"]},
         "tick_source": "linuxcnc.stat.taskbeat",
         "rows": rows,
         "row_count": len(rows),
@@ -243,6 +247,7 @@ def run(duration: float) -> dict[str, Any]:
         "known_boundaries": [
             "native stat exposes motion_id but not full TP segment geometry; active_segment_geometry is explicit null",
             "taskbeat is the public native task-cycle counter; wall-clock is recorded only as diagnostic elapsed_ms",
+            "source run-in-place launcher and installed Python extension must use the same LinuxCNC build; mismatch is blocked",
             "this report is an oracle input and does not claim native/WASM parity by itself",
         ],
         "release_status": "STOP_RELEASE",