chore(todo): file four backlog tasks from the inbox pass

Filed as [#B] work items with their origin proposals preserved under docs/design/: the todo-cleanup dated-seal archiving model, the dated-log planning-line strip plus its lint backstop, a hook to enforce the task-boundary inbox check, and home's colloquialisms / "the list" before-close-queue convention. The first two both touch todo-cleanup.el and are cross-linked to build as one batch. The last two carry the design worked out this session so they start warm.

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