toolcraft: drop root group name from MCP tool prefix

[kamilio]

Problem

runMCP includes the root defineGroup name in every tool path. For:

const root = defineGroup({
  name: "todos-mcp",
  children: [defineGroup({ name: "slack", … })],
});
runMCP(root, { name: "todos-mcp", version: "0.1.0" });

tools are exposed as todos_mcp__slack__fetch_messages. The MCP host already prepends its own mcp__<server>__, so the root name is redundant prefixing. Today the only workaround is name: "" on the root group, which also nukes the commander program name in CLI mode (program.name("")).

Source: packages/toolcraft/dist/mcp.js:

const rootPath = root.name.length === 0 ? [] : [root.name];

Proposal

Change enumerateTools to always start with rootPath = []. The root group's name stays a CLI concept (program name, help breadcrumb); MCP tool paths are built only from child groups and commands. Result above becomes slack__fetch_messages.

The MCP server name is already passed separately via runMCP(root, { name, version }), so nothing is lost.

[poe-code-agent]

Implemented in #277.

Summary:

• MCP tool names now omit the single root group name, so todos-mcp > slack > fetch-messages becomes slack__fetch_messages.
• Updated affected Toolcraft, OpenAPI, terminal-pilot, and markdown-reader tests/docs.
• Verified with targeted tests, Toolcraft lint, and the full pre-push npm run test.

[poe-code-agent]

Issue was resolved by #b1b8875

Update poe-code via npm install -g poe-code@3.0.201