A stage's model input: a SYSTEM turn (instruction/policy) plus the USER turn
(the content to operate on). system is OPTIONAL — when omitted, the stage's
default system (below) is applied; pass it explicitly to override (the chunk
stage passes its EXACT trained system, CHUNK_SYSTEM, so the only trained
adapter decodes byte-for-byte on-distribution).
A stage's model input: a SYSTEM turn (instruction/policy) plus the USER turn (the content to operate on).
systemis OPTIONAL — when omitted, the stage's default system (below) is applied; pass it explicitly to override (the chunk stage passes its EXACT trained system, CHUNK_SYSTEM, so the only trained adapter decodes byte-for-byte on-distribution).