Summary
Implement an IOSXRDeviceResolver for Direct-to-Device (D2D) SSH testing against IOS-XR devices, including platform and model extraction for PyATS/Genie optimization.
Context
PR #11 introduced the extract_os_platform_type() architecture that supports returning os, platform, model, and series fields. When IOS-XR D2D testing is implemented, this resolver will ensure consistent platform/model information is available.
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