Run a verified astcount refactor loop

Optimize Tree-sitter named-node count through a repeatable test-and-measure gate. Do not stop after the first successful decrease. Continue autonomously in the same run; do not hand control back or ask whether to continue merely because one or several refactors passed the gate.

Establish the guard

Require the user's exact deterministic test command before editing. If it is missing, stop and ask for it; do not guess or substitute a different check. Infer the measurement scope from the request, defaulting to the repository.

Resolve one astcount command before measuring: