refactor(cli): extract list and status handlers

[cv]

Summary

Extract the top-level list and status command handlers from bin/nemoclaw.js into a typed module under src/lib/inventory-commands.ts.

Why

This continues the #924 follow-through by shrinking the monolithic dispatcher and moving command logic into reusable typed modules.

Changes

• add src/lib/inventory-commands.ts with:
  • listSandboxesCommand()
  • showStatusCommand()
• add focused tests in src/lib/inventory-commands.test.ts
• reduce bin/nemoclaw.js to thin wrappers that inject legacy dependencies

Testing

• npm run build:cli
• npx vitest run src/lib/inventory-commands.test.ts test/cli.test.js
• npx vitest run --project cli

Stack

Depends on #1544 (refactor(cli): extract OpenShell command helpers). Once that merges, this PR can be retargeted to main.

Relates to #924.

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✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch cv/extract-list-status-handlers

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