Replaces /documents with the Phase A hub: tabs (All/Awaiting them/
Awaiting me/Completed/Expired) backed by per-tab counts via a new
hub-counts endpoint, signature-only chip, type filter, expandable
signer rows, and real-time invalidation across the eight document
socket events. listDocuments grew tab/watcher/signatureOnly/sent-window
filters; the legacy file browser moved to /documents/files where the
sidebar already linked.
Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>
