Add runner package docs.

[dpasiukevich]

No description provided.

[gemini-code-assist]

Summary of Changes

Hello @dpasiukevich, 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 significantly improves the documentation within the codebase, primarily focusing on the runner package to provide a clearer understanding of its role in managing ADK agent execution. It also refines documentation across other core packages by adopting Go's standard [Type] linking syntax, which enhances navigability and interconnectedness of the documentation. Additionally, minor functional enhancements include adding validation for critical configuration parameters in the runner package to ensure robustness.

Highlights

• Runner Package Documentation: Added comprehensive documentation for the runner package, including package-level comments, detailed descriptions for the Config struct and its fields, the New function, the Runner struct, and an expanded explanation for the Run method.
• Documentation Clarity and Navigation: Enhanced documentation across several packages (remoteagent, gemini, session/database, session) by adding package-level comments where missing and updating existing comments to use Go's [Type] syntax for improved readability and direct navigation to referenced types and functions.
• Runner Configuration Validation: Introduced validation checks within the runner.New function to ensure that essential Agent and SessionService fields are explicitly provided in the Config struct, preventing runtime errors from uninitialized dependencies.

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[gemini-code-assist]

Code Review

The pull request primarily focuses on enhancing the documentation across several packages (remoteagent, gemini, runner, session/database, session). This includes adding package-level comments, improving existing function and struct comments with GoDoc links, and clarifying descriptions. Additionally, the runner package introduces crucial validation checks for required configuration fields, significantly improving the robustness of the New function. These changes collectively contribute to better code clarity and maintainability.