Folds the SYST3M-tab removal into the same change that adds /core.html
(per operator review — it should be one PR, not an additive page + a
follow-up). Drops the tab + pane from dashboard.html and ~600 lines of
now-dead renderers/wiring from tabs.js: renderMetaInputs, renderRebuildQueue
+ renderQueueEntry + the rebuild-queue row cache / glyph maps / fingerprint,
renderTombstones, the container-load poll (cload* + start/stopContainerLoadPolling),
the two rqe-* elapsed tickers, the meta/tombstone state + sync + apply
handlers, their SSE dispatch entries, and the SYST3M tab-count.
Deliberately KEPT in tabs.js: rebuildQueueState + syncRebuildQueueFromSnapshot
+ applyRebuildQueueChanged + inFlightOpsByAgent — these don't render the
SYST3M panel, they drive the "building…" / "meta-updating…" badges on the
SW4RM agent cards, so the dashboard still subscribes to rebuild_queue_changed
to refresh those badges (applyRebuildQueueChanged now only re-renders
containers, no panel render).
core.css still imports dashboard.css for the shared section styles; splitting
those out + de-duping the renderers into a shared module remains a follow-up.
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