The per-row S4V3 buttons + per-agent POST /api/{capabilities,tool-groups}/{agent}
were replaced by a single page-level "save all (N agents)" button posting one
atomic batch to POST /api/permissions. Update the dashboard doc to match:
- both matrices stage edits in-browser; nothing writes until "save all"
- describes the batch contract (changes[] with omitted=unchanged / included=full
replace), the caps+groups coalesce-to-one-rebuild-per-agent behaviour, the
atomic validate-all-or-reject semantics, and the dirty-guard on live re-render
- drops the stale per-row save-column (.cap-save-col / .tg-save-col) description;
notes the data-baseline / data-agent dirty-tracking attributes
Documents what shipped in the save-all change; no code change.
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