Implement real integration test suite for configuration workflows

[lipkau]

Problem

The current integration test surface is effectively a placeholder (Integration, NotImplemented) and does not validate real-world configuration behaviors.

Proposal

Design and implement a real integration suite covering critical module scenarios, with clear separation between smoke and broader integration coverage. Include CI wiring for reliable execution and artifact output.

Acceptance criteria

• Placeholder integration test is replaced by executable integration scenarios
• Core configuration workflows are covered (read/write/update/remove/persistence)
• Integration tests are tagged and can be filtered by scope (smoke/full)
• CI runs at least smoke integration checks on PRs (or equivalent guardrail)
• Integration test results are published as CI artifacts