feat(core): support shipping built-in skills with the CLI

[NTaylorMullen]

Summary

This PR enables the Gemini CLI to ship with built-in skills. It updates SkillManager to load skills from the packages/core/src/skills/builtin directory and includes this directory in the core package build.

Details

• Implements discoverBuiltinSkills in SkillManager to load skills from the package bundle.
• Updates copy_files.js to ensure the skills/builtin directory is included in the core package build.
• Marks built-in skills with an isBuiltin flag, allowing them to be filtered in UI.

Related Issues

Fixes #16289

How to Validate

1. Run npm run build from the root.
2. Verify that any built-in skills added to packages/core/src/skills/builtin are copied to packages/core/dist/skills/builtin.
3. Start the CLI and verify built-in skills are loaded by SkillManager.

Pre-Merge Checklist

• Updated relevant documentation and README (if needed)
• Added/updated tests (if needed)
• Noted breaking changes (if any)
• Validated on required platforms/methods:
  • MacOS
    • npm run
    • npx
    • Docker
    • Podman
    • Seatbelt
  • Windows
    • npm run
    • npx
    • Docker
  • Linux
    • npm run
    • npx
    • Docker

[gemini-code-assist]

Summary of Changes

Hello @NTaylorMullen, I'm Gemini Code Assist¹! I'm currently reviewing this pull request and will post my feedback shortly. In the meantime, here's a summary to help you and other reviewers quickly get up to speed!

This pull request introduces the capability for the Gemini CLI to ship with pre-packaged, built-in skills. It modifies the skill loading mechanism to include a new discovery process for these skills and updates the build script to ensure they are correctly bundled with the core package. This enhancement streamlines the distribution of essential functionalities directly within the CLI.

Highlights

• Built-in Skill Discovery: The SkillManager has been updated to discover and load built-in skills from a dedicated packages/core/src/skills/builtin directory within the package bundle.
• Build Process Integration: The copy_files.js script now ensures that the skills/builtin directory is included in the core package build, making these built-in skills available at runtime.
• Skill Identification: Discovered built-in skills are now explicitly marked with an isBuiltin flag, which can be used for filtering or special handling in the UI or other parts of the application.

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[gemini-code-assist]

Code Review

This pull request introduces support for shipping built-in skills with the Gemini CLI. The changes in SkillManager to discover skills from a new builtin directory are well-implemented and robust, correctly handling cases where the directory might not exist. The accompanying change to the build script copy_files.js correctly copies these skills into the distribution package. The overall implementation is clean, correct, and aligns with the project's existing structure. I have reviewed the changes and found no issues of high or critical severity.

[github-actions]

Size Change: +450 B (0%)

Total Size: 22.3 MB

ℹ️ View Unchanged

Filename	Size	Change
./bundle/gemini.js	22.3 MB	+450 B (0%)
./bundle/sandbox-macos-permissive-closed.sb	1.03 kB	0 B
./bundle/sandbox-macos-permissive-open.sb	890 B	0 B
./bundle/sandbox-macos-permissive-proxied.sb	1.31 kB	0 B
./bundle/sandbox-macos-restrictive-closed.sb	3.29 kB	0 B
./bundle/sandbox-macos-restrictive-open.sb	3.36 kB	0 B
./bundle/sandbox-macos-restrictive-proxied.sb	3.56 kB	0 B

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