Complete bd-95: Add content-addressable identity (ContentHash field)

internal/storage/sqlite/ready_test.go

@@ -863,7 +863,7 @@ func TestExplainQueryPlanReadyWork(t *testing.T) {
 		    WHERE d.type = 'parent-child'
 		      AND bt.depth < 50
 		  )
-		SELECT i.id, i.title, i.description, i.design, i.acceptance_criteria, i.notes,
+		SELECT i.id, i.content_hash, i.title, i.description, i.design, i.acceptance_criteria, i.notes,
 		       i.status, i.priority, i.issue_type, i.assignee, i.estimated_minutes,
 		       i.created_at, i.updated_at, i.closed_at, i.external_ref
 		FROM issues i