2.26.0-beta.3 (2026-04-08)

Bug Fixes

• mate: sync avatar and profile in chat on mate_updated (3335e72)
• rewind: harden rewind against race conditions (502e904)
• sessions: use atomic writes for session files (30ea57c)
• usage: handle SDK restart causing negative cost delta (15e5553)
• usage: stop overcounting session cost by 15x (1b733f5)
• usage: stop resetting cumulative cost tracker between turns (2c5ea11)

Features

• usage: show per-turn cost delta alongside cumulative total (e638891)