Health page gains PendingUpdatesHealthTiles (stale instances / sites with stale
artifacts, Deployer+Administrator only, site-scope narrowed, shared cache). New
GetPendingUpdates management command (Deployer) and 'health pending-updates' CLI
leaf. Flatten/cache computation untouched; the command reads
IPendingUpdatesEvaluator directly because the UI cache is not reachable from
ManagementService.
Claude-Session: https://claude.ai/code/session_01GT67AEHd2Acv1YPwGfXEoV
Joseph Doherty