Add Multi Agent Systems documentation to Linear integration page (#1101)

This PR adds documentation about Multi Agent Systems to the Linear
integration page.

The changes include:
1. Adding a new "Multi Agent Systems" bullet point in the Capabilities
section with a link to the new section
2. Adding a new "Multi Agent Systems" section at the end of the page
with:
   - Overview of how child agents work with Linear issues
   - Best practices for triggering child agents
   - Guidelines for sharing context and code between agents
- Information about "grandfather agents" (child agents creating their
own child agents)

These additions will help users understand how to effectively use Multi
Agent Systems with Linear integration.

---

[💻 View my work](https://codegen.sh/agent/trace/21175) • [About
Codegen](https://codegen.com)

---------

Co-authored-by: codegen-sh[bot] <131295404+codegen-sh[bot]@users.noreply.github.com>
Co-authored-by: jemeza-codegen <jmeza@codegen.com>

Author: codegen-sh[bot]

docs/integrations/linear.mdx

@@ -21,8 +21,8 @@ Connect your Linear workspace to Codegen to enable agent interactions.
 </Card>
 
 <Note>
-  API access allows agents to interact with issues and projects according to
-  your permissions in Linear.
+  API access allows agents to interact with issues and projects according
+  to your permissions in Linear.
 </Note>
 
 ## Capabilities
@@ -31,6 +31,7 @@ The Linear integration provides read and write access, enabling agents to manage
 
 - **Read Access:** Fetch issue details, read comments, view project status, list team members.
 - **Write Access:** Update issue status (e.g., to "In Progress", "Done"), add comments, link GitHub PRs to issues, create new issues, assign tasks.
+- **Multi Agent Systems:** Create sub-issues and assign child agents to break down complex tasks into manageable pieces. [Learn more](#multi-agent-systems).
 
 ## How Agents Use Linear
 
@@ -40,3 +41,28 @@ Agents use the Linear integration to streamline project management:
 - **Link Code:** Connect implemented changes (GitHub PRs) directly to the relevant Linear issue.
 - **Provide Updates:** Post comments on issues with progress reports, results, or questions.
 - **Create Tasks:** Generate new issues for follow-up work, bugs discovered, or sub-tasks.
+
+## Multi Agent Systems
+
+### Overview
+
+Once you've enabled linear self-assign in the settings [page](https://www.chadcode.sh/settings/permissions), a codegen agent, that has been assigned to a linear issue (or has been tagged in one), can spawn child agents
+by creating sub-issues and assigning itself to those sub-issues. For each sub-issue that codegen assigns to itself a child agent will be spawned and tasked with completing the sub-issue. Once the child agents are
+finished with their tasks they will notify their parent by sending it a message. The parent will then incorporate the child's work into its own as appropriate. 
+
+### Best Practices
+
+#### Triggering the Child Agents
+
+If you'd like to have codegen break up a linear issue into smaller issues and assign them to child agents you should instruct it to do so in the
+description of the original linear issue.
+
+#### Shared Context
+
+Before creating sub-issues and assigning them to child agents the parent agent will produce scaffolding in the form of a git branch and include details
+of this branch in the description of the sub-issues. The child agents will then work off of this scaffolding branch. If you have specific scaffolding requirements
+or context you'd like the child agents to share, please include them in the description of the parent issue.
+
+#### Availability
+
+This feature is only available on the Team Plan.