Gemini CLI v0.56.0 nightly (2026-08-07): changelog and version-bump commits only

Nightly build whose entire content is changelog generation for v0.55.0-preview.1 and v0.54.0 plus a release version bump. No functional change is described.

Tool: gemini-cli · Version: v0.56.0-nightly.20260807.gd5c9a97dc · Significance: 1/5 · docs