DOS-1543: cover command envelope guard

[mdostal]

Closes DOS-1543

Summary

• Add Vitest coverage for isEnvelope in the command-center envelope guard.
• Cover valid envelope data plus malformed boundary cases for sources, timestamp/version fields, source health, clients, and non-object top-level values.

Test

• pnpm --filter @multica/views exec vitest run command/envelope.test.ts

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✨ Finishing Touches

🧪 Generate unit tests (beta)

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