bug(slm-agent): get_redis_client deferred import in _publish_state_change breaks test patching

[mrveiss]

Discovered During

Code review of PR #3415.

Problem

In health_collector.py, get_redis_client is imported inside the _publish_state_change method body (deferred import). All four tests in TestPublishStateChange patch slm.agent.health_collector.get_redis_client — but since the name is never bound at module level, the patch raises AttributeError and the entire test class fails in CI.

Fix

Move from autobot_shared.redis_client import get_redis_client to module-level imports, or change the patch target to autobot_shared.redis_client.get_redis_client.