test: use canonical host command tool id

[chubes4]

Summary

• Updates the host command smoke fixture to use a canonical source/tool host tool id.
• Keeps the smoke aligned with the host tool registry validation that requires stable canonical tool names.

Testing

• npm run host-tool-registry-smoke
• npm run sandbox-tool-policy-smoke
• npm run host-command-tool-smoke

AI assistance

• AI assistance: Yes
• Tool(s): OpenCode (GPT-5.5)
• Used for: Identified the failing smoke during downstream Studio Web stack validation, drafted the minimal fixture correction, and ran targeted validation. Chris remains responsible for review and merge.