Release v0.3.1

Changes from 0.3.0 to 0.3.1

What's Changed

• feat: pass approval context through canUseTool by @cpacker in #210
• feat: agents.delete and session-less models.list by @cpacker in #211
• feat: portable device-status read and subscription by @cpacker in #212
• feat: allow app-server clients to create unpinned agents by @overlord-letta in #204

Full Changelog: v0.3.0...v0.3.1