Add makerjs-playground MCP server for AI-driven IModel development

[deeploop]

Adds tools/playground-mcp/: a stdio MCP server that gives an AI agent a headless edit -> render -> inspect -> fix loop for Maker.js playground IModel JavaScript, plus a browser sync path.

• render_model: run IModel JS in a headless Maker.js sandbox (faithful to the playground's require-iframe execution); returns extents, path/model/ chain counts, captured console, and SVG/DXF/JSON/etc exports, or a structured error with line/column.
• set_playground_code / get_playground_code: validate then publish code to docs/demos/js/mcp/current.js, loadable in the live playground via ?script=mcp/current.
• playground_start/stop/status: manage a no-cache static http-server.
• list_models / list_examples / get_example / makerjs_api: reference data.

Includes test/selftest.mjs (28 checks: render engine, code-file round-trip, real MCP stdio handshake, live http reachability) and .mcp.json for Claude Code.

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