Fix agent server windows crash

[KHARSHAVARDHAN-eng]

HUMAN:

Tested locally in a clean environment.

---

AGENT:

Why

Related to #4156.

Running openhands-agent-server in an isolated environment (for example via uvx) can fail during startup with ModuleNotFoundError because the server imports modules from the openhands.tools namespace, but openhands-tools is not declared as a runtime dependency.

Since openhands-tools also depends on libtmux, both imports are unavailable in a clean installation, causing the server to crash before startup.

Summary

• Add openhands-tools as a runtime dependency of openhands-agent-server.
• Regenerate the lockfile.
• Ensure openhands.tools and its transitive dependencies (including libtmux) are installed automatically.
• Fix startup of openhands-agent-server in isolated uvx environments.

Testing

# Reproduced in a clean virtual environment
uv pip install openhands-agent-server

# Verified server startup
python -m openhands.agent_server

# Lint
make lint

# Test suite
uv run pytest tests/agent_server/

[all-hands-bot]

[Automatic Post]: It has been a while since there was any activity on this PR. @KHARSHAVARDHAN-eng, are you still working on it? If so, please go ahead, if not then please request review, close it, or request that someone else follow up.

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