validate local --model-path reports 'artifact path not specified' and skips the annotation check

[friedrichwilken]

What happens

The documented invocation

model-cli validate local --model-path ./my-model

always outputs

→ Checking required annotations...
Missing required items:
  - artifact path not specified

The annotation check only runs when the undocumented --artifact-path flag is given (it is not listed in validate local --help), and even then it is a placeholder: ✓ Required annotations check (simulated).

Cause

• cmd/validate_local.go:24-36: --artifact-path is copied into modelPath when the latter is empty, but never the other way round, so SetCheckInfo(modelPath, artifactPath) gets an empty artifactPath.
• internal/workflow/check.go:100-116: checkAnnotations bails out on empty artifactPath and otherwise only checks that the directory exists ("simulated").

Expected

• --model-path alone is enough (default artifactPath to modelPath, or drop the separate flag).
• The annotation check parses manifest.json in that directory and verifies the required CNCF annotations, instead of being simulated.