🤖 Repo Assist — automated implementation

Summary

Implements Series.sweepLevel as requested in #236. This function computes a group-level summary (via applyLevel) and then combines each element with its group's summary value using a binary operator — analogous to R's sweep().

New API

Series.sweepLevel
    (level   : 'K1 -> 'K2)
    (summaryOp : Series<'K1,'V> -> 'R)
    (sweepOp : 'V -> 'R -> 'S)
    (series  : Series<'K1,'V>)
    -> Series<'K1,'S>

Usage examples

let s = series [ (1,"a") => 10.0; (1,"b") => 40.0; (2,"a") => 3.0; (2,"b") => 7.0 ]

// Express each value as a fraction of its group sum
s |> Series.sweepLevel fst Stats.sum (/)
// (1,"a") => 0.2,  (1,"b") => 0.8,  (2,"a") => 0.3,  (2,"b") => 0.7

// Demean within each group
s |> Series.sweepLevel fst Stats.mean (-)

Implementation notes

• Uses applyLevel for the group summary, then Series.map to look up each element's group summary by its projected key. This avoids the duplicate-key pitfall that arises when using getAll with repeated mapped keys.
• The existing applyLevel / reduceLevel functions are unchanged — fully backwards-compatible.
• Two files touched: SeriesModule.fs (implementation) and Tests/Series.fs (3 new tests).

Test Status

• ✅ 3 new regression tests: normalise by group sum, demean by group mean, single-element groups
• ✅ All 615 tests pass (was 612 before this change)
• ✅ Build succeeded with 0 errors, 4 pre-existing warnings

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