chore(task): archive 06-27-m1-format-core

completedAt 按实际交付日期 2026-06-27（M1 收尾 AC1-AC12 复核 d245299，CI 双平台绿）

Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>

.trellis/tasks/06-27-m1-format-core/task.json → .trellis/tasks/archive/2026-07/06-27-m1-format-core/task.json

@@ -3,7 +3,7 @@
   "name": "m1-format-core",
   "title": "M1 格式层核心库 + 派生缓存",
   "description": "容错读写库（front matter/平铺YAML/条目文件/book.yaml，保留未知字段+写出防呆）+ Storage Adapter 小端口 + index.db 缓存与重建器 + 41 精准读取接口 CLI。出口：删光 .cache 全量重建测试绿 + 精准读取逐条测试",
-  "status": "in_progress",
+  "status": "completed",
   "dev_type": null,
   "scope": null,
   "package": null,
@@ -11,7 +11,7 @@
   "creator": "codex",
   "assignee": "claude",
   "createdAt": "2026-06-27",
-  "completedAt": null,
+  "completedAt": "2026-06-27",
   "branch": null,
   "base_branch": "v7",
   "worktree_path": null,