Audited and remediated WCAG 2.1 AA violations across MissionControlDashboard
and AgentTopologyMap (FindingDetailModal and DiscoveryRunHistory do not exist
on this branch — documented in audit report).

MissionControlDashboard.tsx (18 violations fixed):
- Skip link + <main id> landmark added
- All decorative icons: aria-hidden="true" throughout
- SeverityIcon variants: role="img" + aria-label per severity level
- ToolCallsPanel status icons: CheckCircle/XCircle labeled for AT
- SessionStatusBadge: role="status"; dot aria-hidden
- AlertFeed filters: aria-pressed + focus-visible:ring-2 + role="group"
- Approve/Deny buttons: aria-label with action context + focus ring
- Alert feed: role="log" + aria-live="polite"
- LiveStatusBar: aria-live="polite" region
- Panels converted to <section aria-label> landmarks

AgentTopologyMap.tsx (14 violations fixed):
- Skip link + <main id> landmark added
- SVG: role="application" + aria-label for keyboard context
- NodeShape: tabIndex=0, role="button", aria-label, aria-pressed, onKeyDown
- focusedId state + visible focus ring (glow) distinct from selected state
- DetailPanel: <aside role="complementary" aria-label>
- DetailPanel close button: aria-label="Close details panel"
- Escape key handler: closes detail panel (no keyboard trap)
- Token load bar: proper role="progressbar" with ARIA values
- Live/Paused toggle: aria-pressed + descriptive aria-label
- All toolbar/legend icons: aria-hidden="true"
- SVG edges/grid/dots: aria-hidden="true"

AgentOutputDiffViewer.tsx (pre-existing build fix, not WCAG):
- Removed 9 non-existent lucide-react imports blocking build
- Renamed Map import to MapIcon to stop shadowing JS built-in Map

docs/WCAG_AUDIT_REPORT.md: full audit report with violation inventory,
fixes applied, remaining items, and WCAG 2.1 AA coverage matrix