David shipped: Added search box to granular homepage for profile discovery

The task was sent to an agent focused on the granular repo.

Inspect the granular repo UI/frontend surfaces relevant to adding a homepage profile search box above the hero headline. Scope: apps/web/src/pages/index.astro, layouts/styles, existing React islands/components, routing conventions, and any design constraints. Do not edit files. Return a concise implementation plan for UI/UX: where component should live, likely Astro/React approach, states (empty, loading, results, no results, error, keyboard), responsive behavior, and risks

This was a read-only audit before execution — David's pattern of commissioning a plan review before coding. The search box was later implemented as a frontend island in the Astro page.