Expose connected MCP tools to code mode as per-server namespaces
(`tools.<server>.<tool>(args)`) and generate the execute tool description
from the catalog: one namespace block per server, each tool rendered with a
TypeScript-style input signature derived from its JSON schema plus its
description, and the calling convention stated up front.
The server/tool split is cosmetic; child-call routing re-joins the segments
into the existing flat catalog key, so it stays exact regardless of
underscores in server or tool names.
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