Eliminates `Provider.require()` from the eidos `Table.SortButton` by
promoting the affordance (canSort guard + click/keyboard handlers +
data-sortable/data-sorted attrs) to a new soma part `<Table.SortTrigger>`.
Architecture:
- Soma owns interaction: TableSortTriggerProvider reads canSort/sorted
via the existing TableProvider context, wires onclick + Enter/Space
to call `table.toggleSort`, and stamps the canonical data-attrs.
- Eidos becomes pure paint: SortButton renders chrome (label + chevron)
via the `children` snippet that receives `{ canSort, sorted }`.
Public API of eidos `<Table.SortButton>` is unchanged — consumers continue
to write `<Table.SortButton {header}>{header.label}</Table.SortButton>`.
CSS selectors in eidos table.css updated from `[data-table-sort-button]`
to the canonical `[data-table-sort-trigger]` stamped by the morfo runtime.
Test result unchanged: 2391/2397 passing. No regressions.
Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>
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