Why: main advanced with agent-stack audit batch-1; resolve the Bus struct conflict by keeping both hostProjectGuard and operationQuery. Evidence: go test ./internal/cmdbus ./internal/app ./internal/runmgr ./internal/server ./internal/store pass locally (SELF). Impact: scratch host guard retained alongside the new operation query port; deps gitlinks match origin/main. Refs: Agent-System-Backend#241 Co-authored-by: Cursor <cursoragent@cursor.com>