Function build_context 

pub fn build_context(
    user_id: String,
    session_id: String,
    history: Vec<Message>,
    memory: Option<UserMemory>,
    history_window: Option<usize>,
) -> AgentContext

Builds an agent context from components.

This is a convenience function for constructing AgentContext with appropriate defaults and optional memory/history truncation.

Arguments

• user_id - User identifier
• session_id - Session/conversation identifier
• history - Full conversation history (will be truncated)
• memory - Optional user memory
• history_window - Maximum messages to include (defaults to DEFAULT_HISTORY_WINDOW)