Refusals

Every refusal code of the host, plus the engine warning the empty scope carries. A new code literal without a table row fails the reference gate.

code	origin	when
QUERY_TOO_BROAD	host	the from-product estimate passes the limit before execution
SNAPSHOT_CHANGED	host	a continuation names another snapshot
FULL_NEEDS_ONE_PACKAGE	host	full: true with a scope wider than one package
RESPONSE_TOO_LARGE	host	the answer misses the byte budget even at one row
ROWS_TRUNCATED	host	the page shows a window of a larger result
CORPUS_EMPTY	kernel	the scope matched no snapshot package, written by the engine itself