🤖 This is an automated PR from Repo Assist.

Implements the Frame.empty and Series.empty values requested in #56.

What's Added

Series.empty

let empty<'K, 'V when 'K : equality> : Series<'K, 'V>

Returns an empty series with no keys or values.

Frame.empty

let empty<'R, 'C when 'R : equality and 'C : equality> : Frame<'R, 'C>

Returns an empty data frame with no rows or columns.

Example

let s : Series(int, float) = Series.empty
let df : Frame(int, string) = Frame.empty

// Useful as a starting point for fold-style frame construction:
let df =
    columns
    |> List.fold (fun acc (name, data) -> acc |> Frame.addCol name data) Frame.empty

Design Notes

• Both are typed let bindings with explicit type parameters — the F# compiler infers the concrete type from usage context, exactly as callers expect.
• The implementation delegates to the existing Series([], []) / Frame([], []) constructors so there is no duplication of logic.

Test Status

✅ All 490 tests pass (5 new tests added covering empty series and frame creation, merging, and column addition).

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