Share Record Identity Renderer

1. Implementation

• Add a shared operator-ui RecordIdentity component.
• Use the shared component in Explore feed rows.
• Use the shared component in stream table cells and mobile cards.
• Use the shared component in the record detail header.
• Add brand CSS for the shared identity states.

2. Validation

• Add cross-surface parity and id-only demotion tests.
• Run operator-ui TypeScript validation.
• Run console and site TypeScript validation.
• Run touched-file Ultracite validation.
• Run adversarial Honesty-gate verification.