chore: add changeset for client-provided runId fix (#25)

Author: dustintownsend

.changeset/accept-client-runid.md

@@ -0,0 +1,11 @@
+---
+"@workflow-worlds/starter": patch
+"@workflow-worlds/mongodb": patch
+"@workflow-worlds/redis": patch
+"@workflow-worlds/turso": patch
+"@workflow-worlds/testing": patch
+---
+
+Accept client-provided runId for run_created events
+
+The upstream @workflow/core runtime now generates runId client-side and passes it to events.create() for run_created events. Updated all world implementations to accept the client-provided runId instead of rejecting non-null values. Falls back to server-generated runId when null is passed for backward compatibility.