D3: coder/reviewer sandboxes cannot read the product records repo and
list_requirements stays PM/CTO-only (row 90, #1584). The bus now quotes
the task-cited approved requirement texts (exact text, id, title, citing
task refs, snapshot id, product key, records commit) into the
implementation and review continuations, resolved host-side through the
same catalog resolver behind the scoped requirements verb, never from
model input. Quotes are bounded at 16384 bytes and framed as quoted
data; an unresolvable or revoked snapshot degrades to an ask-PM line
without blocking the task. No role, tool or schema widened; one duty
note each in roles/coder.md and roles/reviewer.md.