Include examples in code coverage metrics

[wphillipmoore]

Context

Part of the cross-port examples consistency effort tracked in
mq-rest-admin-project/mq-rest-admin-common#119.

Ruby is the only port that includes examples in coverage metrics today.
All ports should follow this standard.

Current state

• Examples live in examples/ — correct
• Examples are importable modules with typed results — correct
• 7 integration tests exist in tests/integration/test_examples.py — correct
• Coverage command uses --cov=pymqrest which excludes examples/

Work required

1. Change CI coverage command from --cov=pymqrest to include examples
   (e.g., --cov=pymqrest --cov=examples or adjust source paths)
2. Run coverage — identify any uncovered lines in example modules
3. Add tests or adjust examples to reach 100% coverage on example code
4. Update coverage enforcement to include examples in the threshold

Files to modify

• .github/workflows/ci.yml (coverage command)
• pyproject.toml (coverage source paths, if configured there)
• tests/integration/test_examples.py (if additional tests needed)

References

• Standard: Review examples implementations for consistency across language ports mq-rest-admin-common#119
• Gold standard implementation: mq-rest-admin-ruby