Remove explicit status tracking from namespace registry #8948
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What changed?
Remove explicit lifecycle status tracking from the namespace registry.
Updated tests to guarantee Stop is called exactly once.
Why?
The namespace registry is managed by fx lifecycle hooks, which guarantee Start() and Stop() are called exactly once in order. The status tracking was defensive code that duplicated guarantees already provided by fx. Other components like the Nexus endpoint registry already rely on fx without internal status tracking.
How did you test it?
Potential risks
Tests call Start() and Stop() directly rather than through fx. These calls are no longer idempotent so behavior is undefined if a test misuses them. Existing tests are correct.