Add drill-down namespace views under the Polaris sidebar entry. Each
namespace gets a sidebar sub-item registered dynamically from audit data,
linking to /polaris/:namespace with a score summary and per-resource table.
Introduces a shared PolarisDataContext so the sidebar registrar and view
components share a single data fetch. Also updates the Artifact Hub
repository ID.
Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>
Chris Farhood