chore(sandcastle): use gpt-5.4 as critic model

diff --git a/.sandcastle/constants.ts b/.sandcastle/constants.ts
index 74497537b34c0fa5ddb1cb272e4d41980e4f2eb5..bd6a96358a905eb5f0d1995d12251906d19ee266 100644 (file)
--- a/.sandcastle/constants.ts
+++ b/.sandcastle/constants.ts
@@ -5,7 +5,7 @@ export const AGENT_IDLE_TIMEOUT_S = 300
 
 export const AGENT_ACTOR_MODEL = 'github-copilot/claude-sonnet-4.6'
 
-export const AGENT_CRITIC_MODEL = 'github-copilot/claude-sonnet-4.6'
+export const AGENT_CRITIC_MODEL = 'github-copilot/gpt-5.4'
 
 export const BRANCH_PREFIX = 'agent/issue'