feat(agenda): add S-<f8> dedicated fullscreen agenda frame

I added a standing agenda surface in its own fullscreen frame of the daemon, placeable on its own workspace while the working frames stay untouched. S-<f8> spawns, raises, or closes it. The force-rescan moves to C-M-<f8>.

It shows a today-anchored seven-day view and refreshes every five minutes through org-agenda-redo, so the now-line and synced events stay current without re-scanning the file list. A default-deny minor mode keeps it read-only: only navigation, the engage keys (routed to the working frame), and the frame's own controls are allowed. A failed redo falls back to the last-good snapshot with cloned markers, so the frame is never blank or unrestricted.

I made it a frame of the daemon rather than a second process, so it shares the live state (calendar-sync, edits, the now-line). There's no startup auto-open, and the Hyprland-managed-window variant is a vNext once this proves out.

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