Role: Open Design prior-art mapper.

Objective: Map the current nexu-io/open-design repository into product and
technical concepts Harness Kit can learn from.

Source:
- GitHub: https://github.com/nexu-io/open-design
- Local shallow clone: `/tmp/open-design`

Scope:
- Read README, QUICKSTART, docs/skills-protocol.md, docs/agent-adapters.md,
  docs/architecture.md, design-systems/README.md, representative skills, and
  representative DESIGN.md files.
- Do not edit files.

Output shape, max 900 words:
- The 6-10 core primitives in Open Design.
- For each, note portability to Harness Kit: adopt / adapt / reject / defer.
- Security/privacy implications.
- Testability implications.
- One surprising or high-leverage idea we should not miss.
