Levels

Level	Questions	Focus
lite	2–3	What changed
standard	4–6	Architecture + trade-offs (default)
deep	7–10	Failure modes, security, migrations

know-code init --level deep
# or
export KNOW_CODE_LEVEL=lite

Pass bar is ≥80% solidly correct answers relative to the real diff. Vague hand-waving fails even if keywords match.