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* fix(ecstore): optimize ObjectInfo clone and fix critical TODOs ## ObjectInfo hot-path clone optimization (issue #653 item 2) - Wrap user_defined (HashMap), user_tags (String), parts (Vec) in Arc - Clone cost reduced from ~20 heap allocations to O(1) ref count bump - Updated 11 downstream access sites with explicit deref where needed ## Critical TODO/FIXME fixes (issue #653 item 7) - rpc/peer_s3_client.rs: descriptive error message for empty peer response - set_disk/write.rs: concurrent rollback deletes via tokio::spawn + join_all - store_list_objects.rs: resolved FIXME with explanation + 4 regression tests - store/bucket.rs: namespace write locks for make_bucket and delete_bucket Skipped TODOs (too risky without broader context): - multipart.rs:30 nslock — causes lock timeout in existing tests - bucket.rs:88 cached list_bucket — needs cache invalidation strategy - bucket.rs:149 replication delete — needs replication subsystem integration 1134 tests pass (1 flaky under parallel execution, passes individually). * fix: address PR #3149 review comments - Preserve NamespaceLockQuorumUnavailable variant in bucket create/delete - Fix cancellation test to actually test cancellation (keep senders open) - Update ObjectInfo consumers in app/ for Arc-backed fields - Update bucket_usecase.rs user_tags to Arc<String> * fix: update ObjectInfo Arc consumers * fix: address ecstore merge review comments * fix: cancel blocked merge output sends * fix(ecstore): satisfy ObjectInfo clone clippy