mass artifact update

[coryodaniel]

Summary

• Add mass artifact update command for updating imported artifact payloads
• Supports --file (required) for the new payload and --name (optional) for renaming
• Only works for imported artifacts; provisioned artifacts can only be updated by a provisioner.

Details

• The GraphQL mutation only sends name and payload — deprecated specs/data fields are never included so legacy artifact data is preserved
• When --name is omitted, the CLI fetches the existing artifact to echo back its current name (backend requires name on update)
• Follows existing patterns: API wrapper in pkg/api/artifact.go, command logic in pkg/commands/artifact/update.go, cobra wiring in cmd/artifact.go

Usage

# Update artifact payload
mass artifact update <artifact-id> -f artifact.json

# Update artifact payload and rename
mass artifact update <artifact-id> -f artifact.json -n new-name