Add Linear agent integration docs

[mintlify]

Summary

• Added new agent/linear.mdx page documenting how to connect and disconnect the Linear integration for the agent
• Updated agent/index.mdx to mention Linear as an agent capability and added a card linking to the new page
• Added agent/linear to the docs.json navigation under the Agent group

Triggered by mintlify/mint@6e9644d which adds Linear as a new agent integration alongside Slack and Discord.

---

Note

Low Risk
Low risk documentation-only change that adds a new page and navigation links; no runtime or security-sensitive code paths are modified.

Overview
Adds documentation for the agent’s Linear integration via a new agent/linear.mdx page covering connect/disconnect steps and noting the feature-flag requirement.

Updates agent/index.mdx to list Linear delegation as a capability and adds a new “Connect Linear” card, and wires the page into the docs.json Agent navigation.

^{Written by Cursor Bugbot for commit a4bd1f5. This will update automatically on new commits. Configure here.}