test: cover remote daemon env forwarding

[honor2030]

Summary

• Add regression coverage that start_remote_daemon() forwards the resolved remote websocket and Browser Use browser id into ensure_daemon().
• This guards against the Bug: start_remote_daemon fails, falls back to local detection errors, manual BU_CDP_WS workaround #181 failure mode where the daemon falls back to local Chrome discovery instead of using BU_CDP_WS.

Refs #181.

Test Plan

• uv run --with pytest --with pillow python -m pytest tests/unit/test_admin.py -q
• uv run --with pytest --with pillow python -m pytest tests -q
• uv run python -m compileall src tests
• uv pip check --python .venv/bin/python
• uv run --with ruff python -m ruff check --select B tests/unit/test_admin.py

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Summary by cubic

Add a regression test to ensure start_remote_daemon forwards the resolved remote CDP websocket and browser ID to ensure_daemon via env vars. Confirms BU_CDP_WS and BU_BROWSER_ID are set so the daemon doesn’t fall back to local Chrome discovery (guards against #181).

^{Written for commit 559bc1b. Summary will update on new commits.}

[cubic-dev-ai]

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