feat: Add support for dotnet CLI commands

[F0rty-Tw0]

Love the tool — the token savings on build/test output are fantastic.

It would be great to have support for dotnet CLI commands. The .NET CLI is notoriously verbose, especially dotnet build, dotnet test, and dotnet restore, which produce a lot of MSBuild noise that eats through LLM context quickly.

Common subcommands that would benefit:

• dotnet build — MSBuild output with tons of repeated info, dependency resolution logs
• dotnet test — verbose test runner output (similar to what rtk pytest already handles)
• dotnet run — startup banners, hosting environment info
• dotnet restore — NuGet resolution logs
• dotnet publish — combines build + packaging output
• dotnet clean — minor but still noisy

The filtering patterns would be similar to what exists for cargo and go — strip informational lines, surface only errors/warnings/test failures. For now we're routing through rtk proxy dotnet in our Claude Code hooks, but native filtering would be a big win.

[danielmarbach]

@F0rty-Tw0 See #172

It is a prototype / first start.

[pszymkowiak]

Tracked in PR #172 — prototype with build/test/restore support including binlog/TRX parsing.