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Long polling UART writes can mask timer interrupts across several tick periods.
PLIC enable-word updates can overwrite a change made by an interrupt handler.
The board example had no simulator tests for either case.
Added two simulator images and a runner. One compares hardware timer progress with
ThreadX ticks after a long print. The other toggles one PLIC source in timer
context while a thread changes another. Both tests fail on the PR code and pass
with the corresponding local fixes.
GCC 15.2.0 and Ninja built both images. erbium_emu reproduced both failures;
control runs passed both tests. Port consistency checks passed. No silicon run.
Assisted-by: Codex (GPT-6-Sol) <[email protected]>
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