P9-S35: MCP server

[samrusani]

Summary

• add a deterministic local MCP server entrypoint and ADR-003 tool surface
• map MCP tools directly onto shipped continuity seams with narrow structured outputs
• add MCP integration and CLI parity tests plus docs for local startup and client use

Validation

• docker compose up -d
• ./scripts/migrate.sh
• ./scripts/load_sample_data.sh
• APP_RELOAD=false ./scripts/api_dev.sh
• curl -sS http://127.0.0.1:8000/healthz
• ./.venv/bin/python -m alicebot_api --help
• ./.venv/bin/python -m alicebot_api.mcp_server --help
• ./.venv/bin/python -m pytest tests/unit/test_mcp.py -q
• ./.venv/bin/python -m pytest tests/integration/test_mcp_server.py -q
• ./.venv/bin/python -m pytest tests/integration/test_mcp_cli_parity.py -q
• ./.venv/bin/python -m pytest tests/unit/test_mcp.py tests/integration/test_mcp_server.py tests/integration/test_mcp_cli_parity.py -q
• ./.venv/bin/python -m pytest tests/unit tests/integration
• pnpm --dir apps/web test
• MCP smoke client against python -m alicebot_api.mcp_server