Exercises a wide range of blueprint features and point-functions. Includes deterministic checks, JS-based checks, tool-use tracing, multi-turn with assistant:null, prompt weights, citations, and intentional successes/failures.

A minimal example to show branching on a shared conversation history.

• Common history is repeated in each fork.
• Only the final user turn differs to create a branch.
• Utterances are tiny (single words/short phrases) for clarity.

Demo blueprint exercising assistant:null sequential generation and conversation-aware judging.