Update docs, configs, and scripts

Co-Authored-By: Oz <oz-agent@warp.dev>

scripts/test_python_client.py

@@ -16,9 +16,12 @@ def load_dotenv(dotenv_path: Path) -> None:
         line = raw_line.strip()
         if not line or line.startswith("#") or "=" not in line:
             continue
+        if line.startswith("export "):
+            line = line[len("export ") :].strip()
+
         key, value = line.split("=", 1)
         key = key.strip()
-        value = value.strip().strip('"').strip("'")
+        value = os.path.expandvars(value.strip().strip('"').strip("'"))
         os.environ.setdefault(key, value)
 
 
@@ -27,7 +30,10 @@ def main() -> int:
     load_dotenv(repo_root / ".env")
 
     backend_port = os.getenv("BACKEND_PORT", "8000")
-    model_id = os.getenv("GEMMA_MODEL_ID", "google/gemma-3-1b-it")
+    model_id = os.getenv("GEMMA_MODEL_ID")
+    if not model_id:
+        print("[test_python_client][error] GEMMA_MODEL_ID is not set in .env.", file=sys.stderr)
+        return 1
     api_key = os.getenv("VLLM_API_KEY", "EMPTY")
     base_url = f"http://localhost:{backend_port}/v1"