cv2.putText only supports ASCII (Hershey fonts); the middle-dot in the
label rendered as garbage on saved screenshots. screenshot_label builds
an ASCII-only 'ID STATE' string for the annotation; the Qt live-view
label is unchanged. 72 tests pass.
Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>
AlertDispatcher de-duplicates by event_id and fires each side effect once
per CONFIRMED: annotated screenshot, one JSONL line (config_version,
source_id, no rtsp/credentials), sound and popup via injectable sink.
44 tests pass; real-frame artifact smoke verified.
Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>