[fredheathcote007]

Summary

• Close internally owned asynchronous OpenAI chat clients when their ReMe component is closed; retain externally injected clients as borrowed resources.
• Finish provider cleanup safely under repeated cancellation and handle failed close/startup without losing ownership tracking.
• Account for lazy client construction before startup, model replacement, shutdown/restart and access after shutdown.
• Add adversarial lifecycle tests for these boundaries while preserving existing component behaviour.

Validation

• Python 3.12: 42 passed across OpenAI model-adapter and base-component lifecycle tests.
• Python compilation, focused Ruff correctness checks and git diff --check passed.

Scope

Only the OpenAI chat adapter and its unit tests are changed. No dependencies or configuration defaults are changed.

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