[liuben666]

Summary

Adds unit tests for the deprecation helpers in agentops/helpers/deprecation.py, which previously had no test coverage:

• deprecated decorator — asserts the wrapped function still returns its result (pass-through) and emits exactly one deprecation warning on first call, and that repeated calls do not spam the log (deduplication via _shown_warnings).
• warn_deprecated_param — asserts the correct message is emitted both with and without a suggested replacement.

The tests use monkeypatch to capture logger.warning output and reset _shown_warnings for deterministic assertions.

Test plan

• pytest tests/unit/helpers/test_deprecation.py passes
• No production code changed; this is test-only.