chore: import upstream snapshot with attribution

examples/custom_bootloader/bootloader_hooks/pytest_custom_bootloader_hooks.py

@@ -0,0 +1,24 @@
+# SPDX-FileCopyrightText: 2021-2026 Espressif Systems (Shanghai) CO LTD
+# SPDX-License-Identifier: CC0-1.0
+import pytest
+from pytest_embedded import Dut
+from pytest_embedded_idf.utils import idf_parametrize
+
+
+@pytest.mark.generic
+@pytest.mark.parametrize(
+    'config',
+    [
+        'default',
+        # log_v2 routes ESP_LOG through esp_rom_output_to_channels() -> _putc2. This config
+        # verifies that logging works correctly in bootloader hooks (before BSS is cleared),
+        # where _putc2 must be initialized to a safe noop rather than left as NULL/garbage.
+        'log_v2',
+    ],
+    indirect=True,
+)
+@idf_parametrize('target', ['esp32s3', 'esp32c3'], indirect=['target'])
+def test_custom_bootloader_hooks_example(dut: Dut) -> None:
+    # Expect to read both hooks messages
+    dut.expect_exact('This hook is called BEFORE bootloader initialization')
+    dut.expect_exact('This hook is called AFTER bootloader initialization')