chore: import upstream snapshot with attribution

examples/system/freertos/psram_stack/pytest_psram_stack_example.py

@@ -0,0 +1,21 @@
+# SPDX-FileCopyrightText: 2026 Espressif Systems (Shanghai) CO LTD
+# SPDX-License-Identifier: CC0-1.0
+import re
+
+import pytest
+from pytest_embedded import Dut
+from pytest_embedded_idf.utils import idf_parametrize
+from pytest_embedded_idf.utils import soc_filtered_targets
+
+
+@pytest.mark.generic
+@idf_parametrize('target', soc_filtered_targets('SOC_SPIRAM_SUPPORTED == 1'), indirect=['target'])
+def test_psram_stack_example(dut: Dut) -> None:
+    dut.expect_exact('Initialising flash dispatcher')
+
+    output = dut.expect_exact('Example complete', timeout=15, return_what_before_match=True).decode(
+        'utf-8', errors='ignore'
+    )
+    for i in range(3):
+        assert re.search(rf'worker\[{i}\]: stack @ 0x[0-9a-f]+ +-> PSRAM', output)
+        assert re.search(rf'worker\[{i}\]: flash read OK', output)