Build Insights MVP Go-Live

## Summary
Tracking epic for the Build Insights (BI) **MVP go-live** — the scope required to bring BI to parity with Build Analysis (BA), deploy to production, validate with no regressions, document, and execute repo onboarding. Build Insights is now homed in [dotnet/build-insights](https://github.com/dotnet/build-insights).

## Definition of Done
BI reaches functional parity with BA, is deployed to **PME (Production)** and **Int**, validated against real PRs with no regressions, documented, and the go-live/onboarding plan is executed.

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🤖 _Drafted by an AI agent on behalf of @michalpavelka._

Start by reviewing the Build Insights repository at dotnet/build-insights and comparing its current scope with Build Analysis. The go-live is done when functional parity is reached, deployment to PME and Int is validated against real PRs without regressions, documentation is complete, and repository onboarding is executed.

Written by the indexing model from the issue text.