Implement progressive query admission, session boundaries and event-driven Studio observations

src/execution-world/candidate.ts

@@ -15,7 +15,10 @@ import {
 } from "./metadata.js";
 const rootPattern = /^\/nix\/store\/[a-z0-9]{32}-[^/\s]+$/;
 async function readJson(root: string, file: string, scope: CandidateMetadataScope) {
-  const input = await readCandidateMetadata(join(root, file), scope, 32 * 1024 * 1024);
+  // Query Trees add checked projections to an already large application plan.
+  // The Reader now exceeds 32 MiB even without indentation. This file bound
+  // does not replace the stricter aggregate/owner parse-allocation budgets.
+  const input = await readCandidateMetadata(join(root, file), scope, 64 * 1024 * 1024);
   try {
     return {
       value: JSON.parse(new TextDecoder("utf-8", { fatal: true }).decode(input.bytes)),