4582274ba4
Add AgentFn<Opt = void> as the formal agent boundary type:
- Input: ThreadContext (fixed), Output: string (fixed)
- Opt: agent-specific structured options (e.g. { workspace } for Cursor)
Add createAgentAdapter<Opt>(agent, extract) → AdapterFn bridge in
workflow-util-agent, plus createSimpleAgentAdapter for Opt = void.
Also fixes: workflow-cas composite flag + cursor tsconfig reference.
Refs #252