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Dev-only instance, no bookmarks — per family rule 22, fully remove old paths instead of shimming them. - Delete the /plugins/host_agent/ (index) and /plugins/host_agent/settings/ redirect routes; delete the now-dead host_list.html fleet template. - Move the remaining management POST routes off /settings/ to /fleet/ (add-host, rotate-token, delete) — single canonical prefix. - Repoint real callers to canonical URLs: dashboard widgets (host resources → /hosts/, history → /plugins/host_agent/fleet/), the full-metrics page breadcrumb + back link (→ the host hub), Settings→Ansible link, and the agent panel's curl-install link. Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>