Clear EC4 waiting display on stop

[Mamat79]

What changed

• removes the By Mamat line from the EC4 LiveProfessor waiting screen while keeping the small ASCII fader
• sends the EC4 total-display clear SysEx before the MIDI port closes
• prevents a canceled waiting timer from repainting the screen during shutdown
• documents the behavior in French and English

Why

The waiting screen should remain minimal and must not stay frozen on the EC4 after the user presses Stop or fully quits Controller Studio.

Validation

• python -m pytest tests/test_bridge.py -q — 33 passed
• python -m pytest -q — 233 passed
• python -m compileall -q src
• git diff --check
• packaged EXE content inspection passed
• packaged smoke test returned exit code 0
• installed EXE hash matches the rebuilt V.2026.4 binary

[chatgpt-codex-connector]

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[chatgpt-codex-connector]

Clear the display after background producers stop

When Stop is pressed while a MIDI connection is completing or an OSC callback is in flight, the display is cleared before _osc_server.stop() and before the reconnect thread is joined. Those paths can subsequently send a startup banner or overlay SysEx, after which the MIDI port closes and leaves that newer screen frozen on the EC4. Quiesce the OSC and reconnect workers first, then send the clear immediately before closing MIDI.

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