[mcp] fix: isolate tools list metadata

[Wangmerlyn]

Summary

• return a deep defensive copy from MCP tools/list so local callers cannot mutate the shared tool registry
• add a regression test covering top-level and nested schema mutation plus later tools/call dispatch
• document the snapshot contract in AGENTS.md and the MCP guide

Verification

• PYTHONPATH=src pytest tests/mcp/test_server.py -k mcp_tools_list_returns_snapshot_not_mutable_registry -q
• PYTHONPATH=src pytest tests/mcp/test_server.py -q
• mkdocs build --strict
• pre-commit run --all-files --show-diff-on-failure
• PYTHONPATH=src pytest tests -q

README note: Zenodo DOI badge remains present at README.md:5.

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Review details

⚙️ Run configuration

Configuration used: defaults

Review profile: CHILL

Plan: Pro

Run ID: 9ed9b306-650e-42d0-97cb-c5d98e5f79e2

📥 Commits

Reviewing files that changed from the base of the PR and between b277a4a and c0b710c.

📒 Files selected for processing (4)

• AGENTS.md
• docs/guides/mcp.md
• src/keep_gpu/mcp/server.py
• tests/mcp/test_server.py

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch codex/mcp-tools-list-copy

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