ben-manes / caffeine / #5680

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Harden the simulator combined-report and chart steps

CombinedCsvReport matched --metric against the CSV headers case-
sensitively and swallowed a miss into empty cells, which later made the
chart step crash on all-null data. Resolve the metric ignoring case and
fail loudly, listing the available metrics, when it is absent.

PlotCsv computed the value axis as the data range plus a proportional
margin, so equal values gave a zero-width range the chart cannot draw.
Use a fixed window when the span is zero and fail with a clear message
when there are no numeric points.

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