refactor(agenda): replace the dedicated frame with a full-frame F8

- F8 now fills the whole frame instead of three quarters.
- The agenda rebuilds itself on every five-minute wall-clock mark.
- Quitting restores the window layout it took over.
- The dedicated agenda frame and its tests are gone.
- S-<f8> returns to the force-rescan.

The frame bought live shared state. It paid for that with a read-only deny policy, engage-routing and a snapshot failure path. All of it existed only because the agenda shared a process with my working frames. A full-frame F8 needs none of it.

The refresh rebuilds only a visible agenda. It keeps point on its line. The body is guarded, because a signal in a repeating timer resignals every tick.

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