Prompt to install skills on firebase init

[joehan]

Description

During firebase init, prompt the user if they would like to install Agent Skills.

Scenarios Tested

[gemini-code-assist]

Summary of Changes

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This pull request streamlines the initial setup experience for Firebase users by integrating an optional prompt during firebase init to install Agent Skills. This enhancement aims to make it easier for developers to get started with Agent Skills by offering a guided installation process, centralizing the underlying installation logic into a new, reusable module, and updating existing functionalities to leverage this new utility.

Highlights

• Agent Skills Prompt in firebase init: A new prompt has been added to the firebase init command, asking users if they would like to install Agent Skills for Firebase. If confirmed, the skills are installed in the background.
• New agentSkills Module: A dedicated module (src/agentSkills.ts) was introduced to encapsulate the logic for prompting and installing Agent Skills, making it reusable and testable.
• Refactored Skill Installation: The existing skill installation logic within src/firebase_studio/migrate.ts has been refactored to utilize the new installAgentSkills function from the dedicated module.
• Improved Test Coverage: New unit tests (src/agentSkills.spec.ts) were added for the promptForAgentSkills and installAgentSkills functions, and existing migration tests were updated to reflect the refactoring.

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[gemini-code-assist]

Code Review

This pull request introduces a new feature to prompt users to install Agent Skills during firebase init. It adds new utility functions for prompting and installing agent skills, along with comprehensive unit tests. The existing agent skills installation logic in firebase_studio/migrate.ts has been refactored to utilize these new utilities, reducing code duplication. Review comments suggest improving logging consistency in src/agentSkills.ts and using the getErrMsg utility for error message extraction.