[mcp-gw] Support for new MCP protocol (2026-07-28, stateless)

[ashtarkb]

Summary

Split out of #170 (1/3).

• Add a stateless MCP 2026-07-28 Locust user (mcp_2026_user.py) alongside the existing stateful mcp_session_user.py.
• Wire runtime.protocol_mode (stateful/stateless) through runtime_config.py to select the Locust user class/env vars.
• Point the mock server deployer/image at the new-protocol build and update deploy_mock_servers.
• Update test_phase.py and mcp_gateway README.md accordingly.

Files

• projects/agentic_tools/locust/locust_runtime/locustfile_main.py
• projects/agentic_tools/locust/locust_users/init.py
• projects/agentic_tools/locust/locust_users/mcp_2026_user.py
• projects/agentic_tools/mcp/toolbox/deploy_mock_servers/main.py
• projects/mcp_gateway/README.md
• projects/mcp_gateway/orchestration/config.d/mock_servers.yaml
• projects/mcp_gateway/orchestration/config.d/runtime.yaml
• projects/mcp_gateway/orchestration/preflight_phase.py
• projects/mcp_gateway/orchestration/runtime_config.py
• projects/mcp_gateway/orchestration/test_phase.py

Test plan

• Smoke: protocol_mode: stateful Locust job still mounts mcp_session_user + mcp_client
• Smoke: protocol_mode: stateless Locust job mounts mcp_2026_user and mock servers get the new-protocol image

Made with Cursor

[openshift-ci]

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[kpouget]

/lgtm