Bug Bash - EP+Performance compile paths and fixes

[mahabayana]

Changes

Bug 1 – Missing ready state output after EnsureReadyAsync

• No feedback was printed after calling EnsureReadyAsync(), making EP readiness hard to debug
• Added a Console.WriteLine to show the updated ReadyState after the call completes

Bug 2 – Remove DISABLE from ep_policy options

• DISABLE was listed as a valid --ep_policy value but just set policy to null
• Unknown values silently fell back to DISABLE instead of reporting an error
• Removed DISABLE, unknown values now throw an error with valid options listed
• Updated help text and READMEs in both C++ and C#

Bug 3 – EP+Performance-specific compiled model paths

• Compiled models always saved as SqueezeNet_ctx.onnx, so different EP/perf configs overwrote each other
• Added GenerateCompiledModelPath() in both C++ and C# that encodes EP policy/name, device type, and perf mode into the filename
• Example: SqueezeNet_ctx_PREFER_NPU_MaxPerformance.onnx
• Users can still override with --compiled_output
• Updated READMEs with examples of auto-generated filenames

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[adrastogi]

I see that there's an open PR for addressing the issue w/ the DISABLE option: (#620). How would you all like to reconcile this? @mahabayana @yeelam-gordon

[mahabayana]

@adrastogi @yeelam-gordon
The samples require either --ep_policy or --ep_name to be set. The following scenarios fail due to DISABLE:

Scenario 1 : User explicitly passes DISABLE: The user runs --ep_policy DISABLE. The parser sets ep_policy = null and ep_name remains empty. Validation sees neither is set and throws: "Missing EP selection" - even though the user did specify a policy.

Scenario 2 : User passes an invalid value (e.g., a typo): The user runs --ep_policy NPUU. The parser prints "Unknown EP policy: NPUU, using default (DISABLE)" and silently sets ep_policy = null. Validation again throws "Missing EP selection" : masking the real error (an invalid value)

Thus I would propose this resolution

• Removed DISABLE as a valid --ep_policy option. If the user's intention is to default to CPU behavior, they can use DEFAULT instead, making DISABLE redundant.
• Unknown values now throw immediately with the list of valid options (NPU, CPU, GPU, DEFAULT), so typos and invalid inputs are caught at parse time rather than falling through to a incorrect validation error