Jason
3ef6416e3f
feat: AGC phase 7 — AGC Monitor visualization tab with throttled redraws
Add AGC Monitor tab to both tkinter and PyQt6 dashboards with:
- Real-time strip charts: gain history, peak magnitude, saturation count
- Color-coded indicator labels (green/yellow/red thresholds)
- Ring buffer architecture (deque maxlen=256, ~60s at 10 Hz)
- Fill-between saturation area with auto-scaling Y axis
- Throttled matplotlib redraws (500ms interval via time.monotonic)
to prevent GUI hang from 20 Hz mock-mode status packets
Tests: 82 dashboard + 38 v7 = 120 total, all passing. Ruff: clean.