[codex] Add an evolve-mcp launcher with SSE support

[gaodan-fang]

Summary

This PR adds a dedicated evolve-mcp console script for launching the MCP server and extends the launcher so it can run over either stdio or sse.

What Changed

• added evolve-mcp = "altk_evolve.frontend.mcp.__main__:main" in pyproject.toml
• updated the MCP launcher to parse --transport, --host, and --port
• kept the existing UI background thread behavior for stdio
• routed sse mode directly through mcp.run(...) without starting the UI thread
• updated README commands to use the exported launcher
• added unit tests covering script export, stdio behavior, and SSE behavior

Why

The previous docs pointed at module or fastmcp invocations directly. This change provides a single supported entrypoint for local usage and MCP client configuration, while also making SSE launch behavior available from the same command.

Impact

• users can launch the MCP server with uv run evolve-mcp
• SSE transport can be started with uv run evolve-mcp --transport sse --port 8201
• the documented MCP startup flow is simpler and more consistent

Validation

• uv run pytest -v tests/unit/test_mcp_launcher.py

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ℹ️ Review info

⚙️ Run configuration

Configuration used: defaults

Review profile: CHILL

Plan: Pro

Run ID: 9f61d062-b063-4fff-8cde-62155c9a1e47

📥 Commits

Reviewing files that changed from the base of the PR and between 805886a and bddaaa0.

📒 Files selected for processing (4)

• README.md
• altk_evolve/frontend/mcp/__main__.py
• pyproject.toml
• tests/unit/test_mcp_launcher.py

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch support-mcp-launcher

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