Share Record Identity Renderer

Explore rendered record identity independently in the feed row, stream table, mobile card, and detail header. That allowed id-only records to appear as confident detail-page titles even when no manifest-authored display role existed.

The owner console needs one honest visual contract for record identity. Before this change, each Explore surface assembled its own identity line and the detail page could render a raw record key as the primary header.

The reference implementation SHALL render Explore record identity through one shared presentation model across feed row, stream table cell, mobile card, and record detail header surfaces. The shared model SHALL use manifest-authored display roles as the only source of confident primary-title treatment and SHALL NOT synthesize primary-title semantics from field names.