feat(client): add AXONFLOW_DEMO env var for demo mode

Author: gzak

axonflow/client.py

@@ -364,6 +364,11 @@ def __init__(
             msg = "endpoint is required (or set AXONFLOW_AGENT_URL environment variable)"
             raise TypeError(msg)
 
+        if os.environ.get("AXONFLOW_DEMO") == "1":
+            resolved_endpoint = "https://demo.getaxonflow.com"
+            if not client_id:
+                raise TypeError("client_id is required in demo mode (AXONFLOW_DEMO=1)")
+
         if isinstance(mode, str):
             mode = Mode(mode)