The schedules card, the notification router card (flows and recent
deliveries) and the flow editor showed a bare 'loading…' line. They now show
grey placeholders in the layout of what is coming: schedule cards with the
real card's row heights, flow cards with a block for the graph, the
deliveries table's header over blank rows, and lines for the editor.
Every docs directory moves under 1-getting-started, 2-handbook,
4-implementation or 5-project; the options reference (section 3) comes from
the website and has no directory here. trust-boundary stays whole under the
handbook for now. web-ui, swarm and tools split between handbook and
implementation, and the command-line references move to
2-handbook/reference. Links, path references in code and nix, and the docs
index follow the moves; no page content changes.
