[Feature] Expand command palette smoke coverage for recently added commands

[ConnorQi01]

Summary

The current commands.test.ts smoke suite only verifies that "Start Packager" is visible in the command palette. Several commands added or refactored in recent releases have no smoke-level visibility check: cleanRestartPackager, installPods, runEasBuild, expoDoctor, expoPrebuild, and expoPrebuildClean.

Why this is useful

Command palette visibility is the primary entry point for most users. A regression that hides or renames a command would go undetected until a user reports it. Expanding coverage to recently touched commands closes that gap with minimal test complexity.

Suggested scope

• Add visibility assertions in commands.test.ts for the commands listed above, following the existing pattern
• Keep each assertion as a separate it block or extend the parameterized loop already used in networkInspector.test.ts
• No new helper infrastructure needed

Evidence

• test/smoke/suites/commands.test.ts currently has a single test for "React Native: Start Packager"
• cleanRestartPackager, installPods, runEasBuild, expoDoctor, expoPrebuild, expoPrebuildClean were all added or refactored in commits since 2026-03-01 (see src/extension/commands/)
• networkInspector.test.ts (added in PR Add Network Inspector smoke suite and refactor dispose logic #2624) demonstrates the loop pattern that can be reused

Validation

• Run the smoke suite and confirm all new assertions pass
• Rename one command title in package.json temporarily to confirm the test catches the regression