Document tea CLI for remote git server operations

AGENTS.md

@@ -256,6 +256,23 @@ incremental progress.
 - Draw layers: BG → entities → FG → particles → HUD
 - Camera transforms world coords to screen coords
 
+## Remote Git Server
+
+The remote git server is a Gitea instance. Use the **`tea` CLI** (not `gh`) for all remote
+operations: pull requests, issues, releases, and repository management.
+
+```bash
+tea pr create --title "..." --description "..."   # Create a pull request
+tea pr list                                        # List open PRs
+tea issue list                                     # List issues
+tea issue create --title "..." --description "..."
+tea pr merge <number>                              # Merge a PR
+```
+
+Do NOT use `gh` (GitHub CLI) — it will not work with this remote.
+
+After creating a pull request, always check out the `main` branch (`git checkout main`).
+
 ## Commit Messages
 - Imperative mood, concise
 - No co-authored-by or AI attribution