Add BaseDriverUpdater with retry, timeout, and rollback pipeline - #282
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…lback pipeline - BaseDriverUpdater: abstract base class implementing IGeneralDrivelution with unified pipeline - RetryPolicy: configurable retry with exponential backoff support - DefaultPipelineSteps: built-in Validate, Backup, Install, Verify step implementations - DrivelutionOptions: add UseExponentialBackoff configuration flag The base class provides: - Unified validate-backup-install-verify pipeline with retry on transient failures - Timeout enforcement via linked CancellationTokenSource - Automatic rollback on failure when backup exists - Event hooks for step start/completion, progress, and update completion - Structured exception-to-ErrorInfo mapping with suggested resolutions - Subclasses only need to implement InstallCoreAsync Closes #281
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Summary
Add the core \BaseDriverUpdater\ abstract class that provides the unified driver update pipeline, along with \RetryPolicy\ and built-in pipeline steps.
Changes
Why
Eliminates ~60% code duplication between Windows and Linux implementations (coming in sub-tasks 3 and 4), and adds features that were defined but never implemented (retry, timeout, unified rollback, progress events).
Closes #281