**T9.1 Example handler (NEW).**
- Repo and paths: omnibase_core `src/omnibase_core/validation/checker_example.py`
- Configuration: every pattern and threshold is a `parameters` entry of the contract -- falsifier: `uv run pytest tests/unit/test_example.py -q` reports every key changing a verdict
- Declared: the handler is resolved from the container with get_service -- falsifier: `uv run pytest tests/unit/test_example.py -q` records the resolution
- Two overlays: the runtime runs on the in-memory default and on the broker overlay with no code change -- falsifier: `uv run pytest tests/unit/test_example.py -q` passes on both
- Zero literal: hardcoded_topic, url_authority and contract_config_compliance report zero on the changed source -- falsifier: `uv run onex validate` prints zero findings
- Replay: disabling a rule row fails its fixture -- falsifier: `uv run pytest tests/unit/test_example.py -q` fails for that rule
