Assigner: hears build.ended and version-released, reads no build log; a want's version and parts come from them

A kept build's or another branch's build names its parts and keeping node from build.ended; the trunk's entry names its version and parts from the version-released whose source is the kept assignment graph revision's. The parts' contract comment says <module>:<artifact>.

Builds: design 47 G §379, §525, §526, A-94, A-96, A-67

Claude-Session: https://claude.ai/code/session_01NcbgfGKaxw984XyAPfLm4h

contracts/ts/seats/meshwants/index.d.ts

@@ -491,7 +491,7 @@ export interface VersionDeliveredEvent {
   "away"?: string[];
   /** the module */
   "module": string;
-  /** the digest of each of its parts, by artifact reference */
+  /** the digest of each of its parts, by `<module>:<artifact>` */
   "parts": Record<string, string>;
   "v": number;
   /** MAJOR.MINOR.PATCH */
@@ -516,7 +516,7 @@ export interface WantsByWantNodeModuleValue {
   /** for a kept build, the build node that keeps it, from the builder's build.ended; the node-engine fetches the build through that node's seat verb kept-artifact, and a want with none from the store (design 47 G section 526) */
   "kept-on"?: string;
   "newest"?: string;
-  /** the digest of each of the module's parts, by artifact reference; the node-engine fetches and checks each part by it (design 47 G section 379) */
+  /** the digest of each of the module's parts, by `<module>:<artifact>`; the node-engine fetches and checks each part by it (design 47 G section 379) */
   "parts"?: Record<string, string>;
   "put"?: boolean;
   "release"?: string;