Gemini CLI 0.55.0 nightly (2026-07-30): changelog and version-bump commits only

Automated nightly build. The only listed changes are bot-generated changelog entries for v0.54.0-preview.0 and v0.53.0 plus a version bump, so there is no user-facing change in this build.

Tool: gemini-cli · Version: v0.55.0-nightly.20260730.gdc859e8e4 · Significance: 1/5 · docs