Add a Python MCP client example for adopters

[madeinplutofabio]

Summary

Ship a minimal Python script that drives ncp-mcp-server via the official MCP Python SDK. Adopters who do not use a GUI MCP-compatible host (or who want to integrate NCP directly into Python automation) currently have no canonical example. We have a working pattern already (examples/mcp/ci_smoke.py uses raw JSON-RPC); this issue adds the SDK-driven companion.

Why this is a good first issue

• Self-contained: one new Python file under examples/mcp/.
• No Rust knowledge needed; basic Python plus the well-documented MCP Python SDK is enough.
• Acceptance criteria are concrete and testable.

Acceptance criteria

• New file examples/mcp/python_client_example.py.
• Uses the official mcp Python SDK (pip install mcp). Document the install step in the script's docstring.
• Spawns the release-built ncp-mcp-server binary via mcp.client.stdio.stdio_client against examples/graphs/echo-pipeline/graph.yaml.
• Performs initialize then tools/list then tools/call(name="org.ncp-examples.echo-pipeline", arguments={...}), closes stdin, asserts clean exit.
• Prints the structuredContent returned by the tool call.
• Cross-platform (Linux, macOS, Windows). Same constraints as ci_smoke.py (binary path uses .exe suffix on Windows).
• Docstring explains: install, run, expected output.

Out of scope

• Adding the script to CI (the existing ci_smoke.py is the required check; this script is an adopter example, not a CI gate).
• Wrapping it as a CLI or library.

Where to read

• examples/mcp/ci_smoke.py for the raw-JSON-RPC version (mirrors the same dialog)
• examples/mcp/README.md for the directory landing page (update this to mention the new example)
• MCP Python SDK docs: https://github.com/modelcontextprotocol/python-sdk

[beanscg]

Bean Labs took a public-source pass on this issue.

The narrowest useful next step looks like: Propose a docs/reproduction checklist that turns the report into one copy-pasteable maintainer verification path.

Public evidence checked:

• issue state OPEN; repo public by GitHub issue search; assignees=0; comments=0
• title: Add a Python MCP client example for adopters
• license: Apache-2.0 (detected from public raw LICENSE/COPYING file)

A good acceptance check would be a narrow public change that directly exercises the issue's reported boundary.

No PR opened from this pass.