Summary
Implement an NDFCDeviceResolver for Direct-to-Device (D2D) SSH testing against NDFC-managed NX-OS switches, 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. NDFC manages NX-OS fabric switches and would benefit from this capability when D2D testing is implemented.
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