[yufoo1]

Go2 adaptation remains deferred for cleanup. The physical demo documentation is handled independently in #16.

Run ActiveVLN on a physical Go2 through a unified SDK2/camera owner and a separate EmbodiInfer HTTP service. Add the deployment configuration and CLI for single-chunk, repeated-chunk and overlap execution, with a 3× physical demo and bilingual setup instructions.

Keep the existing navigation-command import compatible. This PR leaves tests/ identical to main and includes no new test dependencies.

Demo and dependencies

• Go2 demo — 3×, 9 seconds
• Serving adapter: feat(activevln): serve recurrent Go2 navigation requests EmbodiInfer#19 (pinned submodule).
• Media: docs: add Go2 and ActiveVLN engine demo media misc#3; merge before publishing the canonical documentation links.
• RPent remains in the dependent feat(rpent): add event-driven ActiveVLN navigation #15.

Validation: existing CLI/protocol/boundary checks (33 passed, 22 optional skips), Ruff, both strict documentation builds, and the preparation lock check passed. No new physical run was performed; the demo is the approved recording and excludes the manual head-return sequence.