【新規投稿】
E2E Test Atom Blog : New Atom Post (E2E Test v1.3.0)
http://localhost:8999/posts/atom-new-001</link> <id>atom-new-001-guid</id> <updated>2026-06-17T13:00:00Z</updated> <summary>This is a new Atom test post for E2E verification.</summary> <link rel=