v1.1.0

[1.1.0]

Added

• Session pin accessors on both clients: session_pin() returns the pin in use (constructor-passed, auto_session-generated, or set later; None when unpinned), set_session_pin() pins subsequent requests to a session (None unpins), and new_session() switches to a freshly generated pin and returns it.
• Chat history accessors: history() returns the stored turns as role/content dicts, oldest first, and set_history() replaces them, for restoring a persisted conversation. Invalid turns raise InputError.
• write_history() and set_write_history() read and toggle turn recording after construction. Turning recording off keeps the stored history and still sends it; only recording stops.
• history_usage() returns summed token usage across the calls that built the stored history. The tally resets with clear_history() and set_history(). Each call resends the conversation so far, so input tokens count what the server processed (as billed), not unique tokens.
• Added a package-specific exception hierarchy in sthai.exceptions, exported from the top-level package: SthaiError (root), InputError, TransportError, APIStatusError with ClientError (4xx) and APIError (5xx), and ResponseError with ResponseParseError. Catching SthaiError is enough to handle anything the client raises.
• HTTP error responses now parse the server's error body: ClientError and APIError carry status_code, server_message, error_type and the raw response.