User-visible knobs need a home: the Vision feature page explains why native embeds ride
the session and what each key does (subagent-only default cap, clamp range), the
configuration reference points at it next to auxiliary.vision so the two sections are
not confused, cli-config.yaml.example carries the commented block, and tools/AGENTS.md
names vision_tools_history_budget.py as the single owner of embed-cost policy.