T3 Code Adds Guest Thread Sharing

This is a small feature with outsized workflow impact: agent sessions become shareable collaboration artifacts rather than isolated conversations.

• –Preserves thread context when handing work to teammates
• –Reduces screenshot-and-copy workflows during debugging
• –Makes async review of agent output easier
• –Strengthens T3 Code’s position as a collaboration layer across coding agents
• –Guest access will need clear permissions and privacy controls before broader adoption