Implement Anuva Linear issue {{ISSUE_ID}} in anuva-bento.
Use $anuva-development:linear-implement-issue to validate ownership, Ready
state, blockers, and Product Main inputs. Start through anuva work start. Create
the local change
folder index and ImplementationPlan, then pause for explicit approval of that
exact plan. After approval, implement only Bento-owned scope, maintain
ImplementationLog, update durable docs, run upstream compatibility plus focused
downstream verification, and create CompletionReport. Preview every changed docs
page. Create a linked draft PR through anuva pr create; do not merge or mark Done
in the implementation turn.