Close 1 merged task card and archive it

Why: feature/svc-deploy-source-registry merged via PR #55 (merge 8523415);
its card must be marked done and archived per the no-pending-cards rule.
Evidence: git log --merges origin/main shows 8523415 merging the branch;
card backfilled with PR link and moved to .task/archive/.
Impact: .task bookkeeping only.
Refs: task.sh close

.task/archive/feature-svc-deploy-source-registry.md

@@ -1,6 +1,6 @@
 # feature/svc-deploy-source-registry 任务卡
 
-任务主记录：https://git-home.u1680832.nyat.app:30319/weichen/Agent-System-Dev/pulls/55；状态：已完成（待合入）；owner：weichen
+任务主记录：https://git-home.u1680832.nyat.app:30319/weichen/Agent-System-Dev/pulls/55；状态：已完成（PR #55 已合入 main，8523415）；owner：weichen
 
 ## 基线与授权