Twelve TDD tasks covering: api() signal contract test, useCanRequest
hook, viewer-keyed requestKeys.search, useRequestSearch extension
(signal + viewer key + 5min staleTime + enabled override), invalidation
cascade tests, RequestPosterCard optional onRequest, RequestToAddSection
component (dialog + grid variants), GlobalSearch and Catalog wiring
with empty-state suppression for the library-0/TMDB-pending edge case,
final lint/test pass, and manual smoke. Notes a single deviation from
the spec: submitDisabledReason is null in the initial implementation,
with per-row request data driving disabled UI.
Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>
