feat(server): allow host-owned logging setup

[abhinav-galileo]

Summary

• Add AGENT_CONTROL_CONFIGURE_LOGGING, defaulting to true, so OSS/default server behavior remains unchanged.
• When AGENT_CONTROL_CONFIGURE_LOGGING=false, Agent Control skips installing its own logging handlers.
• In host-owned logging mode, pass log_config=None to Uvicorn so embedding hosts keep their existing logging configuration.
• Add focused coverage for the new config setting, logging no-op behavior, and Uvicorn startup kwargs.

Usage

Default behavior is unchanged:

AGENT_CONTROL_CONFIGURE_LOGGING=true

Embedding hosts that own process logging can disable Agent Control's logging setup:

AGENT_CONTROL_CONFIGURE_LOGGING=false

With that setting disabled:

• configure_logging() returns without changing root or Uvicorn handlers.
• run() passes log_config=None to uvicorn.run(...).
• Existing host logging configuration remains in place.

Validation

• make server-test
• uv run --package agent-control-server mypy --config-file pyproject.toml server/src
• uv run --package agent-control-server ruff check --config pyproject.toml server/src server/tests/test_config.py server/tests/test_logging_utils.py server/tests/test_main_lifespan.py

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.

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