Add polysharp analyzer and make IndentingBuilder internal

[Copilot]

Adds the polysharp analyzer package to IndentingBuilder and restricts its visibility to internal.

Changes

• IndentingBuilder.csproj: Add polysharp 1.14.1 analyzer package reference with standard configuration matching other projects in the repo
• IndentingBuilder.cs: Change class visibility from public to internal

This aligns IndentingBuilder with the analyzer infrastructure used by other packages while limiting its API surface to source-only distribution.

Warning

Firewall rules blocked me from connecting to one or more addresses (expand for details)

I tried to connect to the following addresses, but was blocked by firewall rules:

• ytvvsblobprodcus310.vsblob.vsassets.io
  • Triggering command: /usr/bin/dotnet dotnet build (dns block)
  • Triggering command: /usr/bin/dotnet dotnet restore --no-dependencies /home/REDACTED/work/StaticCs/StaticCs/static-cs.sln --packages /home/REDACTED/work/StaticCs/.codeql-scratch/dbs/csharp/working/packages /p:DisableImplicitNuGetFallbackFolder=true --verbosity normal /p:TargetFrameworkRootPath=/home/REDACTED/work/StaticCs/.codeql-scratch/dbs/csharp/working/emptyFakeDotnetRoot /p:NetCoreTargetingPackRoot=/home/REDACTED/work/StaticCs/.codeql-scratch/dbs/csharp/working/emptyFakeDotnetRoot (dns block)
  • Triggering command: /usr/bin/dotnet dotnet restore --no-dependencies /home/REDACTED/work/StaticCs/StaticCs/test/AotTest/AotTest.csproj --packages /home/REDACTED/work/StaticCs/.codeql-scratch/dbs/csharp/working/packages /p:DisableImplicitNuGetFallbackFolder=true --verbosity normal /p:TargetFrameworkRootPath=/home/REDACTED/work/StaticCs/.codeql-scratch/dbs/csharp/working/emptyFakeDotnetRoot /p:NetCoreTargetingPackRoot=/home/REDACTED/work/StaticCs/.codeql-scratch/dbs/csharp/working/emptyFakeDotnetRoot (dns block)

If you need me to access, download, or install something from one of these locations, you can either:

• Configure Actions setup steps to set up my environment, which run before the firewall is enabled
• Add the appropriate URLs or hosts to the custom allowlist in this repository's Copilot coding agent settings (admins only)

Original prompt

There are two changes we should make: add the Analyzers package to IndentingBuilder, and make IndentingBuilder internal

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