TokenSaver client
Construct the client with api_key and optional base_url, timeouts, provider_api_key defaults, and the chat facade (session factory).
python
from tokensaver_sdk import TokenSaver
ts = TokenSaver(api_key="ts_...")
# Optional: base_url="https://your-stack.example/api/v1"
# Optional: provider_api_key=os.environ["OPENAI_API_KEY"]
ts.chat.session(...) returns a session object for history modes.