Documents the merged 10f operator overview (56a743f, 4cec386) as a
spec-driven change: delta merged into operator-panel-navigation (at-a-glance
region with per-source em-dash degradation and provisions-backed delivering
count, registry-driven system rail with dead-letter-only alarm, brand-neutral
shell, no-skip heading outline). Milestones: 10f code-shipped; 10a screenshot
deferred pending the overview polish follow-up.
cgalo5758
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