The ledger-context digest rides inside gnubok_get_agent_briefing, but the
server-instructions block never told agents to USE it before categorizing or
creating vouchers. This adds that pointer, the AGENTS.md-injection analogue
from the openwiki pattern (dev_docs/ledger_context_resource.md, Discovery):
consult how THIS company books each counterparty/supplier and prefer the
observed patterns over guesses, with explicit mapping rules outranking them,
and historical frequency framed as evidence, not permission to auto-post.
Co-authored-by: Claude Fable 5 <noreply@anthropic.com>
