Tooltips for delegates are terrible

[Krzysztof-Cieslak]

In VS (from @cartermp):

In VSCode:

[Krzysztof-Cieslak]

/repo-assist propose fix for this

[github-actions]

Pull request created: #1485

Generated by Repo Assist

[github-actions]

🤖 This is an automated response from Repo Assist.

I've investigated this issue and created a fix. The root cause is in the delegateTip function in SignatureFormatter.fs and DocumentationFormatter.fs.

The problem: The function was calling getFuncSignatureWithIdent on the delegate's Invoke method, which is designed for aligned member signatures and produces multi-line output with excess indentation. For no-argument delegates (e.g. System.Action), it was especially broken, outputting just unit with no indent:

type Action =
   delegate of
unit
```

**The fix**: Use `FSharpEntity.FSharpDelegateSignature` directly — this API provides the argument names/types and return type, enabling a clean single-line format:

```
type MyDelegate =
   delegate of arg: string -> int

type Action =
   delegate of unit -> unit

type Func<'T1,'T2,'TResult> =
   delegate of arg1: 'T1 * arg2: 'T2 -> 'TResult

PR is ready for review.

Generated by Repo Assist for issue #627

To install this agentic workflow, run

gh aw add githubnext/agentics/workflows/repo-assist.md@afb00b92a9514fee9a14c583f059a03d05738f70