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CodeRabbit raised six; all six were real. The test double had drifted ahead of production. VisualTestDisplayManager accepted set_scrolling_state(frame_hold=...) while DisplayManager did not, so such a call passed every harness run and would raise TypeError on the panel -- the one failure a safety harness exists to prevent. frame_hold belongs to the change that adds it to DisplayManager (#523), so it moves there and the double matches main again. The harness swallowed exceptions from re-rendered frames. _settle_loop re-renders a mode that came back blank, to give a scroll time to draw; returning silently on a crash meant a mode that renders one good frame and then explodes was reported as passing. Recorded on result.error now, keeping the captured frame so the failure stays inspectable. starlark-apps display() returned True after _display_frame() failed, so the controller held a dead frame for the whole display_duration instead of rotating on. _display_frame now returns bool on all three paths. run_plugin_tests.py used env.setdefault for PYTHONPATH and LEDMATRIX_CORE, so an inherited value won and the subprocess imported a different core than the one under test -- ledmatrix-plugins#467 exactly. Prepends PROJECT_ROOT and sets LEDMATRIX_CORE unconditionally. The on-demand mailbox is polled after every frame, ~125x/second on a scrolling mode, and the read is deliberately uncached, so it was that many disk reads per second to find nothing. Floored at 250ms, which is imperceptible for a web-UI click. Consuming it also deleted whatever was present rather than what had just been processed, so a request posted while the previous one was in flight was thrown away and never ran; the delete is now keyed by request_id. That narrows the window rather than closing it -- a true atomic claim needs a primitive the cache layer does not offer, and the code says so rather than implying otherwise. Codacy's 2 criticals were bandit B404/B603 on the subprocess call added to run_plugin_tests.py. Fixed interpreter, argument list, no shell; annotated with the repo's existing nosec convention. Bandit is clean on the file. Adds test/test_on_demand_mailbox.py (8), test_starlark_display_contract.py (4) and two settle cases in test_harness_empty_claimed.py. 4, 4 and 2 of those fail against the pre-fix code. Full suite: 3961 passed. Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com> Claude-Session: https://claude.ai/code/session_014RRtqXDCnvnY6EQwhT5CV9