Fix godoc linting error by adding missing godoc

[rakyll]

Also simply the wording in some existing package godocs.

[gemini-code-assist]

Summary of Changes

Hello @rakyll, 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 primarily focuses on a comprehensive update to the project's godoc documentation. The main objective is to resolve godoc linting errors by ensuring all packages have appropriate documentation and by refining existing comments for improved clarity and conciseness. These changes contribute to better code maintainability and a more accessible understanding of the codebase for current and future developers.

Highlights

• Documentation Coverage: Added missing package-level godoc comments to several packages, including agent/remoteagent, util/instructionutil, and numerous example main packages, to address linting errors and improve documentation completeness.
• Documentation Clarity: Simplified and clarified the wording of existing godoc comments across various packages, such as agent/llmagent, cmd/adkgo, and several cmd/launcher sub-packages, enhancing readability and conciseness.
• Package Renaming: Renamed the gcs package to gcsartifact within the artifact/gcsartifact directory to provide a more descriptive and context-specific name for the Google Cloud Storage artifact service.

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[gemini-code-assist]

Code Review

This pull request does a great job of adding and improving godoc comments across the codebase, which resolves linting errors and enhances documentation. I've identified a few minor typos and areas for improvement in the comments, particularly concerning Go's package documentation conventions for main packages. Additionally, I found an instance of an ignored error in a new example file that should be addressed to follow best practices.