docs(server-changes): correct mollifier-reads endpoint list

`.server-changes/mollifier-reads.md` mentioned an "attempts" endpoint
but no `api.v1.runs.$runParam.attempts.ts` changes exist in this PR
(it's a POST/action route for creating attempts, not a read
endpoint). The actual added endpoints are retrieve, trace, spans, and
events — fix the changelog to match.

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

Author: d-cs

.server-changes/mollifier-reads.md

@@ -3,4 +3,4 @@ area: webapp
 type: feature
 ---
 
-Mollifier API read-fallback: serve buffered runs from synthetic run/trace/span data on the retrieve, trace, spans, and attempts endpoints.
+Mollifier API read-fallback: serve buffered runs from synthetic run/trace/span data on the retrieve, trace, spans, and events endpoints.