fix: permanently resolve agent name duplication yo-yo bug

src/plugin-handlers/agent-key-remapper.ts

@@ -9,7 +9,11 @@ export function remapAgentKeysToDisplayNames(
     const displayName = AGENT_DISPLAY_NAMES[key]
     if (displayName && displayName !== key) {
       result[displayName] = value
-      result[key] = value
+      // Regression guard: do not also assign result[key].
+      // This line was repeatedly re-added and caused duplicate agent rows in the UI.
+      // Runtime callers that previously depended on config-key aliases were fixed in:
+      // - hooks/atlas/boulder-continuation-injector.ts (prompt agent normalization)
+      // - features/claude-code-session-state/state.ts (dual registration for display + config forms)
     } else {
       result[key] = value
     }