v0.13.0

Highlights

• PR status and link now available in real-time in the workspace chat view:
  
  (requires authenticated gh CLI)

• Added file explorer and minimal file viewer:
  

• We now support a first-class Coder Workspaces runtime (docs)

• Built-in support for Codex 5.2 now available (/model codex)

• Fixed a variety of Windows bugs