🤖 Repo Assist — two improvements in this PR (Tasks 4 & 5 for this run).

Task 5: Add Frame.indexRowsApply — closes #206

A new Frame.indexRowsApply function that indexes a frame by a specified column and applies a transformation function to the resulting keys. This directly implements the feature requested in #206.

Before: users had to chain two calls:

frame
|> Frame.indexRows "Date"   // 'Frame(string,_)'
|> Frame.mapRowKeys DateTime.Parse

After:

frame |> Frame.indexRowsApply "Date" DateTime.Parse
// or
frame |> Frame.indexRowsApply "Id" int

Implementation

• FrameModule.fs: adds let indexRowsApply column (f:'V -> 'R2) (frame:Frame<'R1,'C>) : Frame<'R2, _>
  Defined after mapRowKeys (which it calls), in the "Sorting and index manipulation" category.
• FrameExtensions.fs: adds matching IndexRowsApply(frame, column, f:Func<'V,'R2>) extension for C# users.
• tests/Deedle.Tests/Frame.fs: adds 1 test covering the core behaviour (string-column parsed to int keys).

Task 4: Fix build.ps1 version extraction bug

Directory.Build.props uses an MSBuild property expression for (Version):

(Version)$([System.Text.RegularExpressions.Regex]::Match(...).Groups[1].Value)(/Version)

The previous PowerShell code tried to read this as a static XML attribute:

$version = ([xml](Get-Content Directory.Build.props)).Project.PropertyGroup.Version

This returned the literal MSBuild expression string rather than the resolved version number, causing fsdocs to be invoked with a garbled version. The fix reads from RELEASE_NOTES.md directly — consistent with build.sh:

$version = (Select-String -Path RELEASE_NOTES.md -Pattern '^## (\S+)' | Select-Object -First 1).Matches.Groups[1].Value
```

---

## Test Status

All **670 tests** pass on Ubuntu:

```
Passed!  - Failed: 0, Passed: 670, Skipped: 0, Total: 670

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