infra 🚧: poll device assertions

[sstanisicTT]

Ticket

Problem description

Add device assertion polling so that we can implement assertion testing without waiting for the test to timeout

Also add a simple test to check if we can catch an assert from the device

What's changed

Type of change

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to not work as expected)
• Documentation update

Checklist

• All post commit CI passes
• Blackhole Post commit CI passes (if applicable)

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[Copilot]

Pull request overview

This PR introduces device assertion polling functionality that enables immediate detection of device assertions during test execution instead of waiting for timeouts. The implementation adds a new DeviceAssertionError exception class and modifies the polling loop to check for assertions periodically.

Key Changes:

• Added polling for device assertions in wait_for_tensix_operations_finished to detect failures early
• Created a new DeviceAssertionError exception with a cores attribute containing the affected RiscCore enums
• Added a test (test_device_assert_hit.py) to verify assertion detection works correctly

Reviewed changes

Copilot reviewed 3 out of 3 changed files in this pull request and generated 3 comments.

File	Description
tests/sources/device_assert_hit_test.cpp	New C++ test kernel that intentionally triggers an assertion on TRISC1 (math core) to validate the polling mechanism
tests/python_tests/test_device_assert_hit.py	New Python test that verifies DeviceAssertionError is raised and captures the correct core information
tests/python_tests/helpers/device.py	Introduces DeviceAssertionError class, modifies handle_if_assert_hit to raise it instead of a generic exception, adds assertion polling to the wait loop, and removes unused HardwareController import

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[sstanisicTT]

I gave up trying to implement resetting a single Tensix core after a runtime assertion. For now once a runtime assertion happens the board gets reset so the following tests can pass correctly. Once I get a response from the Tensix team I will fix this.