Add URL-driven Agent Health page (/agents, /agents/:appId,
/agents/:appId/:instanceId) that progressively narrows from all
applications to a single instance with trend charts. Create
generic GroupCard composite for grouping instances by application.
Expand mock data to 8 instances across 4 apps with varied states.
Split sidebar Agents header into navigable link + collapse chevron.
Update agent tree paths to /agents/:appId/:instanceId. Add EventFeed
with lifecycle events. Change SidebarAgent.tps from string to number.
Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>
