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

src/execution-world/metadata.ts

@@ -10,10 +10,10 @@ export class CandidateMetadataBudget {
   private scopes = 0;
   private readonly owners = new Map<string, number>();
   // A cutover holds both the serving and proposed installation plus transient
-  // parsing space. The 57-repository reader retains ~133 MiB per installation;
-  // a 256 MiB owner ceiling cannot admit its ordinary atomic replacement.
+  // parsing space. The Reader with checked Query Trees retains ~176 MiB per
+  // installation; its replacement also needs transient parse/index space.
   // Keep the aggregate ceiling independent and leave room for parsing overlap.
-  constructor(limits = { bytes: 512 * 1024 * 1024, ownerBytes: 384 * 1024 * 1024, candidates: 128 }) {
+  constructor(limits = { bytes: 768 * 1024 * 1024, ownerBytes: 512 * 1024 * 1024, candidates: 128 }) {
     for (const value of Object.values(limits))
       if (!Number.isSafeInteger(value) || value < 1) throw Error("INVALID_CANDIDATE_METADATA_BUDGET");
     if (limits.ownerBytes > limits.bytes) throw Error("INVALID_CANDIDATE_METADATA_BUDGET");