There is no DELETE route, no persisted-removal path, and no UI affordance for removing a metric once declared — the engine's RemoveMetricDeclaration message only ever fires as part of whole-profile deletion today. Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com> Claude-Session: https://claude.ai/code/session_01XFUNZwCvz3kcod3352ZR2o