Gemini CLI v0.43.0

Surgical Code Edits: Steered Gemini models to prefer the edit tool for surgical modifications, improving speed and precision ( #26480 by @aishaneeshah).

Session Export and Import: Added the ability to export sessions to files and import them via a new flag, facilitating session portability ( #26514 by @cocosheng-g).

Adaptive Token Estimation: Introduced an adaptive token calculator for more accurate content size estimation, enhancing context management efficiency ( #26888 by @joshualitt).