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
