Prevent deployment status from regressing to FAILED after it's marked as FINISHED by:
1. Calling completeDeployment() first in post_deployment() before any operations that could fail
2. Wrapping all post-deployment side effects in try-catch blocks
3. Adding FINISHED to terminal states that cannot be changed
4. Protecting ExecuteRemoteCommand from overwriting FINISHED status
This fixes the issue where a deployment with a healthy container and successful rolling update was still marked as Failed in the UI.
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Co-Authored-By: Claude <noreply@anthropic.com>
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