feat(graph): implement query methods — topologicalOrder, hasCycles, findCycles, ancestors, descendants, reachableFrom, and call graph queries (filterByStatus, getRoots, children, duration, lineage)

src/graph/index.ts

@@ -1 +1,9 @@
-export { FlowGraph, type FlowGraphOptions } from "./construction.js";
+export { FlowGraph, type FlowGraphOptions } from "./construction.js";
+export {
+  topologicalOrder,
+  hasCycles,
+  findCycles,
+  ancestors,
+  descendants,
+  reachableFrom,
+} from "./queries.js";