[codex] Add phone override for agentic Go2

[Gshfrez]

Summary

• Add a teleop-phone-go2-agentic blueprint that composes phone teleop with the agentic Go2 stack.
• Remap SimplePhoneTeleop.cmd_vel into MovementManager.tele_cmd_vel so hold-to-drive phone input cancels active navigation and temporarily takes manual velocity control.
• Document the new demo/runtime command in the phone teleop README.
• Move python-multipart into the web extra so the FastAPI phone teleop form route is available in web installs.

Why

This gives agentic Go2 demos a simple human-in-the-loop safety override using a phone browser, while preserving the existing lightweight teleop-phone-go2 blueprint.

Demo Path

1. Start teleop-phone-go2-agentic on a Go2.
2. Open https://<host-ip>:8444/teleop on a phone.
3. Start a small autonomous movement or agent/navigation action.
4. Hold the phone drive button and tilt to interrupt/reposition the robot through MovementManager.tele_cmd_vel.
5. Release to stop, then use execute_sport_command("Hello") or RecoveryStand for the close.

Validation

• uv run ruff check dimos/robot/unitree/go2/blueprints/agentic/unitree_go2_agentic_phone.py
• CI=1 uv run pytest dimos/robot/test_all_blueprints_generation.py
• uv run pytest dimos/navigation/movement_manager/test_movement_manager.py
• uv run dimos list | rg 'teleop-phone-go2-agentic|teleop-phone-go2'
• Imported both teleop_phone_go2 and teleop_phone_go2_agentic blueprints successfully.
• Local phone web smoke: PYTEST_VERSION=1 uv run dimos --viewer none run teleop-phone, then curl -k https://127.0.0.1:8444/teleop returned 200 text/html; charset=utf-8.