fix(agent-designer): allowlist full public surface for dead-export guard

Author: TheGreatAxios

scripts/dead-export-allowlist.txt

@@ -53,6 +53,10 @@ agents/warden/src/config.ts: satisfies
 agents/warden/src/config.ts: boolean
 agents/designer/src/index.ts: agent
 agents/designer/src/index.ts: defineAgent
+agents/designer/src/index.ts: director
+agents/designer/src/index.ts: tools
+agents/designer/src/index.ts: systemPrompt
+agents/designer/src/index.ts: config
 agents/designer/src/config.ts: satisfies
 agents/designer/src/config.ts: boolean