Watch.Aspire tool does not provide meaningful help

[karolz-ms]

Repro steps

1. Install Watch.Aspire tool:

   dotnet tool install --global Microsoft.DotNet.HotReload.Watch.Aspire --version 10.0.201

   (as per https://www.nuget.org/packages/Microsoft.DotNet.HotReload.Watch.Aspire/10.0.201).

2. Microsoft.DotNet.HotReload.Watch.Aspire --help

Expected

The tool outputs short description of its purpose and information about invocation arguments and parameters it can take (and what they do).

Actual

Unhandled exception. System.InvalidOperationException: Option '--sdk' is required.
   at System.CommandLine.Binding.ArgumentConverter.GetValueOrDefault[T](ArgumentConversionResult result)
   at System.CommandLine.Parsing.OptionResult.GetValueOrDefault[T]()
   at System.CommandLine.Parsing.SymbolResult.GetRequiredValue[T](Option`1 option)
   at System.CommandLine.ParseResult.GetRequiredValue[T](Option`1 option)
   at Microsoft.DotNet.Watch.DotNetWatchOptions.TryParse(String[] args, DotNetWatchOptions& options) in /_/src/sdk/src/BuiltInTools/Watch.Aspire/DotNetWatchOptions.cs:line 70
   at Program.<Main>$(String[] args) in /_/src/sdk/src/BuiltInTools/Watch.Aspire/Program.cs:line 4
   at Program.<Main>(String[] args)

@tmat argued that the tool is not really meant for direct human use so the help response is low priority, but the --help invocation is the very first thing that an AI tool tried with Watch.Aspire when I was building an app that was using it, and then AI spent a lot of tokens trying to figure out how to use the tool. So I think we should do better.

CC @DustinCampbell

[karolz-ms]

Also it would be nice to be able to invoke the tool just as Watch.Aspire. Microsoft.DotNet.HotReload.Watch.Aspire is a bit verbose.

[tmat]

The tool is to be invoked programmatically, not by humans. You need to set up pipe names, invoke the commands in the right order, pass in SDK paths, etc. The verbosity of the tool name is the least difficulty.