Luxonis Project Interview

Produce a buildable brief: a plain-language project spec in PROJECT_BRIEF.md that a later Luxonis build session can use.

Completion is not a running app. Completion is:

1. PROJECT_BRIEF.md written in the agent's current working directory.
2. The user asked to review it.

Keep the interview product/application-level. Assume this may be the user's first Luxonis interaction.

Rules