Scope lead notes by project and share them with task agents

api/openapi.yaml

@@ -1580,6 +1580,7 @@ components:
       properties:
         id: { type: string }
         text: { type: string }
+        project_id: { type: string, description: "The project the note applies to; absent for a note that applies to every project." }
         created_at: { type: string, format: date-time }
         updated_at: { type: string, format: date-time }