feat: adopt spec 1.24.1 (per-stage iterations, targetError)

DESIGN.md

@@ -1,4 +1,4 @@
-# Simmit TypeScript SDK: v1 Design (revision 2.14)
+# Simmit TypeScript SDK: v1 Design (revision 2.15)
 
 Scope: public surface and foundations only, a design proposal, not an implementation.
 Convention reference: `anthropic-sdk-typescript`; where this doc is silent, that SDK's idiom is
@@ -546,6 +546,13 @@ excluded (as in §9): downloading/parsing the report bytes and the versioned v2/
 
 ## CHANGELOG
 
+rev 2.14 → rev 2.15 (spec 1.24.1):
+
+- Re-vendor (additive, non-breaking). The result summary's `multiStage.stages[]` entries gain
+  optional `iterations` (total iterations the stage's profilesets ran, excluding the headline
+  actor's own) and `targetError` (the `target_error` the stage ran at). Flows through the
+  generated types (`JobResult`), no hand-written change.
+
 rev 2.13 → rev 2.14 (spec 1.23.0):
 
 - Re-vendor (additive, non-breaking). `ArtifactKind` gains `profileset_results` (`profilesets.json`)

src/generated/openapi.d.ts

@@ -1566,6 +1566,10 @@ export interface operations {
                                         profilesets: number;
                                         /** @description Number of profilesets eliminated at the end of this stage based on ranking. `0` for the last executed stage. */
                                         culled: number;
+                                        /** @description Total iterations the profilesets in this stage ran, summed across them. Excludes the headline actor's own iterations. */
+                                        iterations?: number;
+                                        /** @description The `target_error` this stage ran at. */
+                                        targetError?: number;
                                     }[];
                                 };
                             } | null;