Q134: a signal's category comes from its runtime source, so self-checks cannot pass as real traffic

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

src/shared/operations-domain.ts

@@ -9,7 +9,6 @@ export const FEATURE_FLAG_KEY = {
 export const SLO_SIGNAL_KEY = {
   PROVIDER_REQUEST_SUCCESS: "provider_request_success",
   APPROVAL_ROUTE_COVERAGE: "approval_route_coverage",
-  BROWSER_SESSION_BOUNDARY: "browser_session_boundary",
   SKILL_RESOLVE_SUCCESS: "skill_resolve_success",
   MIGRATION_VALIDATION_SUCCESS: "migration_validation_success",
 } as const;