All policy child routes were missing data.breadcrumb, causing the
breadcrumb trail to show only "Policy" regardless of depth.
Added breadcrumbs to: Packs, Governance, Simulation, VEX & Exceptions,
Gate Catalog, Gate Simulation, Environment/Release/Approval Gates,
and Audit. Tab children intentionally omit breadcrumbs since the
tab label provides that context.
Breadcrumb trails now show e.g. "Policy > Governance" or
"Policy > Simulation" matching the sidebar navigation hierarchy.
Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>
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