Add static user agent field (#54)

Update copyright notice in LICENSE file

README.md

@@ -1,6 +1,6 @@
-# GitHub Actions Runner Scale Set Client (Public Preview)
+# GitHub Actions Runner Scale Set Client (Private Preview)
 
-> Status: **Public Preview** – While the API is stable, interfaces and examples in this repository may change.
+> Status: **Private Preview** – While the API is stable, interfaces and examples in this repository may change.
 
 This repository provides a standalone Go client for the GitHub Actions **Runner Scale Set** APIs. It is extracted from the `actions-runner-controller` project so that platform teams, integrators, and infrastructure providers can build **their own custom autoscaling solutions** for GitHub Actions runners.
 
@@ -12,7 +12,7 @@ You do *not* need to adopt the full controller (and Kubernetes) to take advantag
 
 A runner scale set is a group of self-hosted runners that autoscales based on workflow demand. Here's how it works:
 
-1. **Registration**: You create a scale set with a name, which also serves as the label workflows use to target it (e.g., `runs-on: my-scale-set`). Multiple labels can be assigned per scale set. Like regular self-hosted runners, scale sets can be registered at the repository, organization, or enterprise level.
+1. **Registration**: You create a scale set with a name, which also serves as the label workflows use to target it (e.g., `runs-on: my-scale-set`). Like regular self-hosted runners, scale sets can be registered at the repository, organization, or enterprise level.
 2. **Polling**: Your scale set client continuously polls the API, reporting its maximum capacity (how many runners it can produce).
 3. **Job matching**: GitHub matches jobs to your scale set based on the label and runner group policies, just like regular self-hosted runners.
 4. **Scaling signal**: The API responds with how many runners your scale set needs online (`statistics.TotalAssignedJobs`).