Tomasz/con 4203

[tomasz-stefaniak]

Description

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• [] The relevant docs, if any, have been updated or created
• [] The relevant tests, if any, have been updated or created

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Tests

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Summary by cubic

Adds Background Agents: a new mode to trigger long-running agents for your repo and a UI to list and open them. Addresses Linear CON-4203 by enabling agent creation tied to the current workspace and organization.

• New Features
  • Added “background” to MessageModes and ModeSelect with a new icon.
  • Create background agents from editor content; auto-detect repo URL and branch; supports optional organizationId.
  • List background agents in the GUI with status badges, 10s polling, and links to agent detail pages.
  • VS Code messenger implements create/list handlers, repo detection, and GitHub integration prompts on errors.
  • ControlPlaneClient exposes createBackgroundAgent and listBackgroundAgents (with org filtering) and new webview protocol messages.