Add bounded live query cursor continuation

test/query-aggregation.test.ts

@@ -112,6 +112,14 @@ test("typed reference operands and scalar membership tests reject unbounded lite
 test("new runtime operator matrix accepts direct count and rejects unsupported relational plans", async () => {
   const { unsupportedQueryOperator } = await import("../src/execution-world/query-operators.js");
   assert.equal(unsupportedQueryOperator(await compile("aggregate { count }")), undefined);
+  assert.equal(
+    unsupportedQueryOperator(
+      await compileAggregationDocument(
+        `query Report($after: Cursor) {root {tasks(first: 30, after: $after, orderBy: [{cost: ASC}]) {entries {cursor node {cost}} pageInfo {hasNextPage endCursor}}}}`,
+      ),
+    ),
+    undefined,
+  );
   for (const expression of [
     "aggregate { sum { estimatedHours } }",
     "filter(where: {estimatedHours: {gt: 0}}) { aggregate { count } }",

test/query-cursor-validation.test.ts

@@ -0,0 +1,20 @@
+import assert from "node:assert/strict";
+import { test } from "node:test";
+import { loadReaderWorkspace } from "./reader-fixture.js";
+import { compileExecutionPlan } from "../src/execution-world/index.js";
+test("local relationship pages may reuse exactly the confirmed source window", async () => {
+  const workspace = await loadReaderWorkspace((name, text) => {
+    if (name === "queries/replica-inputs.graphql")
+      return text.replace("highlights(all: 1000)", "highlights(first: 10)");
+    if (name === "queries/reader-screen.graphql")
+      return text
+        .replace("ReaderScreen($color: String!)", "ReaderScreen")
+        .replace(
+          "highlights(all: 1000, where: {color: {eq: $color}}, orderBy: [{range: {start: ASC}}])",
+          "highlights(first: 10)",
+        )
+        .replace("_camino { relations { highlights { aggregate { count } } } }", "");
+    return text;
+  });
+  assert.doesNotThrow(() => compileExecutionPlan(workspace));
+});