fix(agent-key): remove ZWSP from config object keys (RFC 7230)

Object keys containing ZWSP characters cause HTTP header validation
failures in OpenCode 1.4.0+, breaking agent registration.

- Use getAgentDisplayName() (no ZWSP) for object keys
- Keep getAgentRuntimeName() (with ZWSP) only in name field for sorting
- Maintains ZWSP sorting for Sisyphus, Hephaestus, Prometheus, Atlas

Fixes #3220

src/plugin-handlers/tool-config-handler.ts

@@ -1,5 +1,5 @@
 import type { OhMyOpenCodeConfig } from "../config";
-import { getAgentDisplayName, getAgentListDisplayName } from "../shared/agent-display-names";
+import { getAgentDisplayName } from "../shared/agent-display-names";
 import { isTaskSystemEnabled } from "../shared";
 
 type AgentWithPermission = { permission?: Record<string, unknown> };
@@ -16,7 +16,7 @@ function getConfigQuestionPermission(): string | null {
 }
 
 function agentByKey(agentResult: Record<string, unknown>, key: string): AgentWithPermission | undefined {
-  return (agentResult[getAgentListDisplayName(key)] ?? agentResult[getAgentDisplayName(key)] ?? agentResult[key]) as
+  return (agentResult[getAgentDisplayName(key)] ?? agentResult[key]) as
     | AgentWithPermission
     | undefined;
 }