Reuse verified immutable plans and streamline cooperative hashing

Continue final hosted development reliability qualification.

src/execution-world/artifacts.ts

@@ -1,13 +1,13 @@
-import { createHash } from "node:crypto";
-import { canonicalJson } from "../capability-model/evolution.js";
 import {
+  executionPlanDigestAsync,
   type ExecutionPlan,
   type PlanPackage,
   ExecutionPlanError,
   hexDigest,
-  hexDigestAsync,
   executionVersions,
 } from "./plan.js";
+import { createHash } from "node:crypto";
+import { canonicalJson } from "../capability-model/evolution.js";
 
 export interface ArtifactFile {
   path: string;
@@ -366,7 +366,7 @@ export async function checkExecutionWorld(
 ): Promise<CheckedWorld> {
   if (canonicalJson(plan.definition.versions) !== canonicalJson(executionVersions))
     fail("world", "Unsupported plan codec versions");
-  if ((await hexDigestAsync(plan.definition)) !== plan.digest) fail("plan", "Plan digest mismatch");
+  if ((await executionPlanDigestAsync(plan)) !== plan.digest) fail("plan", "Plan digest mismatch");
   const manifests = inputs.map(parsePackageArtifacts);
   unique(
     manifests.map((m) => m.packageRevisionId),