fix(pi-agent): enforce a no-tool reasoning profile

语义摘要、变更叙事和 U9 分段改为请求 reasoning。该 profile 的 argv 使用 --no-tools 且不加载搜索扩展；未知 profile 拒绝启动。文档生成仍保留读写工具。

Co-authored-by: Cursor <cursoragent@cursor.com>

docker-compose.dev.yml

@@ -53,6 +53,7 @@ services:
       - ./data/dev/workspaces:/app/data/workspaces
       - ./data/dev/agent_sessions:/root/.pi/agent/sessions
       - ./deploy/pi-agent/runner.mjs:/app/runner.mjs:ro
+      - ./deploy/pi-agent/pi-args.mjs:/app/pi-args.mjs:ro
       - ./deploy/pi-agent/result-v1.mjs:/app/result-v1.mjs:ro
       - ./deploy/pi-agent/extensions:/app/extensions:ro
     tmpfs: