Loading
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Spec: descriptive guidance, not a checkable rule.
It carries no forbidden and instead pair, and no `jig check` detector applies to it directly.
Section: Components and layout

Choose by *what is unknown*, not by preference.

| Situation | Use |
| --- | --- |
| Shape of the result is known | Skeleton matching the real layout |
| Shape is unknown | Spinner, centred in the region it will fill |
| Under ~200ms expected | Nothing. A flash of loading is worse than a brief wait |
| Over ~10s, or a job | Progress with a stage label, and what happens if they leave |
| User-initiated, reversible, high confidence | Optimistic update with rollback on failure |

**Rules**
- Load into the region that will hold the result, never a full-page overlay for a partial update.
- Skeletons match the real content's dimensions, or the layout jumps on arrival.
- A control that triggered loading enters its own loading state (`P-02`) and stays the same width.
- Never animate a skeleton faster than `--duration-slow`; a pulsing grid is more distracting than a static one.
- Announce completion with `aria-live` when focus is elsewhere (`E-35`).