fix: skip role model override on failover handoffs

When forcedAgentType is set (failover), the role's configured model
(e.g. claude-opus-4-6 for reviewer) was injected as CODEX_MODEL,
causing codex SDK to reject it. Now model overrides are only injected
for the primary agent type, not failover runs.

src/container-runner.ts

@@ -494,7 +494,9 @@ export async function runReviewerContainer(args: {
       containerName,
       groupAgentType: group.agentType,
       isCodexAgent,
-      runnerPath: isCodexAgent ? '/app/codex/dist/index.js' : '/app/agent/dist/index.js',
+      runnerPath: isCodexAgent
+        ? '/app/codex/dist/index.js'
+        : '/app/agent/dist/index.js',
     },
     'Container exec runner selection',
   );