[RFC] Add OAP pre-action authorization for skill/tool security

[uchibeke]

DeerFlow 2.0 provides excellent Docker sandboxing and optional human approval for tools - but there's no deterministic, policy-driven authorization layer for tool calls. The Open Agent Protocol (OAP) defines a before_tool_call standard (DOI: 10.5281/zenodo.18901596) that would integrate naturally into DeerFlow's skill execution layer: a JSON/YAML policy declares which tools each agent/skill can invoke, checked automatically before any tool execution. This would give enterprise deployments verifiable, auditable authorization boundaries without requiring manual approval for every action. Given DeerFlow's focus on autonomous multi-step tasks, OAP integration would be a significant differentiator for production deployments that need automated guardrails.

Please let me know your thoughts and if I can open a Pull Request to add this. Thank you

[WillemJiang]

@uchibeke thanks for the proposal, it sound good to me, please open a PR for it.