docs(sessions): add documentation for chat recording and session management

[bl-ue]

This PR adds complete docs for the automatic saving and resuming functionality originally implemented in #4401.

Closes #13072

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Note: This PR is the 8th in a series of PRs that implement automatic chat recording and resuming in both interactive and non-interactive modes, with command line flags for non-interactive resuming and session management, and an interactive session browser.

PR #4401 was the original monolithic PR, which implemented this feature from the ground up. It's too large to merge as-is, however, and so it was broken up into several smaller PRs, of which this PR is the 8th.

Please see #4401's description for the full context of this PR. The original monolithic PR's description contains a detailed analysis of the entire system, with an example of the recording JSON and a demo video.

[gemini-code-assist]

Summary of Changes

Hello @bl-ue, 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 extensive documentation for the Gemini CLI's automatic chat recording and session management capabilities. It provides users with clear guidance on how conversations are automatically saved, how to effectively resume past interactions using both command-line arguments and an interactive session browser, and methods for listing and deleting old sessions. Additionally, it details configuration settings for managing session retention policies and limiting individual session lengths, ensuring users can tailor the CLI's behavior to their needs. This documentation is a crucial step in making the previously implemented features accessible and understandable.

Highlights

• Comprehensive Documentation for Session Management: This pull request introduces extensive documentation for the Gemini CLI's automatic chat recording and session management features.
• Interactive Session Browser: Detailed explanation of the /resume slash command, which opens an interactive session browser allowing users to search, sort, manage, and resume past conversations.
• Command-Line Session Control: Documentation for new command-line flags including --resume (to load sessions), --list-sessions (to view available sessions), and --delete-session (to remove sessions).
• Configurable Session Retention and Limits: Instructions on configuring sessionRetention policies (maxAge, maxCount) and maxSessionTurns to manage conversation history and individual session lengths within settings.json.

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[gemini-code-assist]

Code Review

This pull request introduces comprehensive documentation for the new session management features, including automatic chat recording, resuming sessions, and cleanup policies. The changes include a new session-management.md page, updates to the commands.md and configuration.md pages to reflect the new /resume command and related CLI flags, and an update to the sidebar for navigation. The documentation is well-structured, clear, and provides helpful examples. The changes are excellent and I have no further feedback.

[Elvedina598]