Add local runtime smoke tests for LLamaSharp and ONNX flows

[KSemenenko]

Problem

Local runtime support needs deterministic smoke coverage so the repo can catch integration regressions early.

Scope

• Track smoke tests for LLamaSharp and ONNX runtime flows
• Cover readiness, basic inference execution, and compatibility failures at a high level
• Keep the tests lightweight enough for routine use where appropriate

Out of scope

• Full performance benchmarking
• External provider adapter tests

Implementation notes

• Keep local-runtime smoke tests deterministic and small-model-friendly
• Align the tests with the local runtime abstraction and model-vault work
• Preserve separate concerns from broader CI strategy

Definition of Done

• The issue defines the minimum smoke coverage needed for local runtimes
• Later runtime work can add the right checks without scope ambiguity

Verification

• Review the issue against the local-runtime epic and testing policy

Dependencies

• Parent epic: [Epic] Expand automated validation for the control-plane product #21
• Related epic: [Epic] Add local runtime support beyond external provider CLIs #19