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Closes #398

Summary

Implements Stats.describe for Frame<'R,'C> (and corresponding FrameStatsExtensions.Describe for C#), a long-requested (#398) pandas-style summary statistics method.

What it does

Calling Stats.describe frame produces a Frame(string, 'C) with one column per numeric column of the input frame, and these row keys:

Only columns convertible to float are included (via frame.GetColumns(float)()). Non-numeric columns are silently dropped, matching the behaviour of pandas.

Usage (F#)

let df = Frame.ofColumns [ "Open", openSeries; "Close", closeSeries ]
let summary = Stats.describe df
// summary is a Frame(string, string)
// summary.["Open", "mean"]  -> mean of Open column
// summary.["Close", "min"]  -> min of Close column

Usage (C#)

var summary = df.Describe();
// summary["Open", "mean"]  -> mean of Open column

Root cause / approach

Stats.describe already exists for Series<'K,'V> and returns a Series(string, float). The frame variant simply maps this function over all numeric columns via frame.GetColumns(float)() |> Series.map (fun _ s -> Stats.describe s) and assembles the result into a frame using FrameUtils.fromColumns.

Files changed

Test Status

✅ All 495 existing tests pass.
✅ New test describe works for frame passes.

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