Add Agents and Flows pattern documentation

Emily Baumanrequested to merge
duo-edit-20251105-191912 into main

Adds a new pattern page for Agents and Flows under the GitLab Duo Agent Platform section.

This page documents the different types of AI assistance available in GitLab:

  • Duo: General AI assistant for exploration and flexible help
  • Agents: Specialized AI team members for domain-specific tasks
  • Flows: Automated playbooks for repeatable processes

The page includes:

  • Overview of each type
  • When to use each approach
  • Decision framework for choosing between them
  • Examples for each type
  • Content guidelines (naming conventions, capability descriptions)
  • Accessibility considerations (discoverability, transparency, control)

The page is positioned in the navigation under: Patterns → GitLab Duo Agent Platform → Agents and Flows

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