Adds Agent Sessions View documentation guide

[jjsilva4]

Fixes #

Proposed Changes

• Introduces a new Help Center guide demonstrating the Agent Sessions View workflow.
• Guides users on leveraging a coding agent to review, identify outdated content, and update markdown documentation across repositories.
• Covers the full cycle from creating an agent session and interacting with the agent to reviewing WIP changes, generating commits with GitKraken AI, and opening a pull request.
• Provides reusable example prompts for common documentation maintenance tasks.
• Emphasizes how Agent Sessions View streamlines the documentation update process by keeping the worktree, agent session, WIP changes, and pull request status connected.