AXP Build Loop

Drive the experiment build loop end-to-end from a coding-agent chat session: take a goal or insight, generate N candidate variants of the artifact under test, implement them in parallel worktrees, evaluate them in isolated axp sandboxes against a naive agent, rank the results, and either promote the winner to a PR or run another lap mutating it.

Six stages, run sequentially: INTAKE → GENERATE → IMPLEMENT → RUN → CHOOSE → LAP or PROMOTE. Complete each stage before the next. Conversation context is working state; the LOOP.md journal (Stage 3) is durable state — keep it current so a fresh session can resume the loop cold.

Requirements

• axp CLI with files: staging support (axp run --help must list --file); Docker running. File staging is local Docker runs only — --remote and --runner e2b reject it.
• git ≥ 2.20 (worktrees), jq, and gh (only needed for the final promote stage).
• Run from the repository of the artifact under test.