Add alignment state indicator and pluggable data sources
- AlignmentThresholds dataclass + VisionEngine.__init__ for injection - alignment_state computed per snapshot (ready/aligning/fault) - MonitorPlot circle/vector/legend driven by state color - Status dot + label moved into POSITION VISUALIZATION panel header - CsvSessionSource + DemoSource pluggable DataSource layer - Synthetic DATA/ready/ and DATA/aligning/ sessions for visual testing - Fix CAM 3 label placement (below circle, not above)
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