- Split handleRecovery into focused helper methods for better maintainability:
* shouldStartRecovery: handles recovery cancellation logic
* createRecoveryContext: manages recovery context and cleanup
* prepareForRecovery: removes DNS settings and initializes OS resolver
* completeRecovery: resets upstream state and reapplies DNS settings
* reinitializeOSResolver: reinitializes OS resolver with proper logging
* Update handleRecovery documentation to reflect new orchestration role
- Improve tests:
* Add newTestProg helper to reduce test setup duplication
* Write comprehensive table-driven tests for all recovery methods
This refactoring improves code maintainability, testability, and reduces
complexity while maintaining the same recovery behavior. Each method now
has a single responsibility and can be tested independently.
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