Add proxy concurrency post: ATS, HAProxy, Envoy architecture

CLAUDE.md

@@ -5,3 +5,14 @@
 - **Never push directly to `main`.** All changes must go through a pull request, no exceptions — including config changes, quick fixes, and single-line edits.
 - Always create a new branch before making changes. Branch names must follow the `ssingh1/<description>` convention (e.g. `ssingh1/add-analytics`).
 - Open a PR after pushing the branch. Only merge after review.
+
+## GitHub Account
+
+This repo belongs to the personal account **`singhsanjay12`**.
+
+Before creating any PR, verify the correct account is active and switch if needed:
+
+```bash
+gh auth status
+gh auth switch --user singhsanjay12
+```