Add example and documentation for kOrtEpDevice_EpMetadataKey_OSDriverVersion

[adrastogi]

Description

This change provides details on the expected value for kOrtEpDevice_EpMetadataKey_OSDriverVersion and provides an example in the plugin EP tests.

Motivation and Context

We introduced a new EP metadata key called kOrtEpDevice_EpMetadataKey_OSDriverVersion in #26616 but neglected to provide sufficient detail to guide EP authors in how to fill in the value for this key. This PR is an attempt to address that gap.

[mingmingtasd]

Thanks for the improvement!

Do you know what the process is to get EP authors to adopt this change? Should I file an internal feature request to OV EP team?

[adrastogi]

Do you know what the process is to get EP authors to adopt this change? Should I file an internal feature request to OV EP team?

Sure, that works (there's a feature request process I can initiate from my end which can do the same thing- but if you have the means of filing one directly, that works too (if you'd want me to do it for any reason, please let me know and I'll get it taken care of)).

[Copilot]

Pull request overview

This PR clarifies how plugin Execution Providers should populate the kOrtEpDevice_EpMetadataKey_OSDriverVersion metadata key by documenting the expected value format and providing a concrete example via the example plugin EP and its associated tests.

Changes:

• Documented the expected os_driver_version value format in onnxruntime_ep_device_ep_metadata_keys.h (4-part dot-separated string).
• Updated the example plugin EP to populate os_driver_version in its EP metadata.
• Extended the auto-EP registration test to assert the example plugin EP reports the expected os_driver_version value.

Reviewed changes

Copilot reviewed 3 out of 3 changed files in this pull request and generated 2 comments.

File	Description
onnxruntime/test/autoep/test_registration.cc	Adds an assertion for the example EP’s os_driver_version metadata value.
onnxruntime/test/autoep/library/example_plugin_ep/ep_factory.cc	Populates os_driver_version in the example EP metadata and documents where it would come from in a real EP.
include/onnxruntime/core/session/onnxruntime_ep_device_ep_metadata_keys.h	Adds documentation describing the expected format/meaning of os_driver_version.

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[mingmingtasd]

Sure, that works (there's a feature request process I can initiate from my end which can do the same thing- but if you have the means of filing one directly, that works too (if you'd want me to do it for any reason, please let me know and I'll get it taken care of)).

Oh sorry, I missed your reply. Yeah, that's great if you could initiate the feature request from your end! Thanks! @adrastogi

[adrastogi]

@skottmckay FYI if you can help me get this over the finish line. Thanks!