Workplan for renaming issue-facade → issue-core and implementing the
POST /issues/ task ingestion endpoint required by activity-core's IssueSink
adapter. Covers rename, state hub registration, INTENT.md, SCOPE.md, REST
endpoint, and NATS design stub.
Hub workstream: 1135fc1d-1f46-4e35-886d-04cc3b8050b6
Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>
