Google is sunsetting consumer Gemini CLI access on 2026-06-18 and
consolidating into Antigravity CLI. codeagent-wrapper already ships a
working AntigravityBackend (confirmed by shelling to `agy`), and
~/.claude/.ccg/prompts/antigravity/*.md role prompts already exist —
only the command markdown files still hardcoded --backend gemini.
Updates multi-frontend.md, multi-execute.md, multi-plan.md, and
multi-workflow.md to route frontend calls through --backend antigravity
instead of --backend gemini, point role-prompt paths at
prompts/antigravity/ instead of prompts/gemini/, and drop the
gemini-only --gemini-model flag (antigravity has no CLI equivalent;
codeagent-wrapper picks its default model).
multi-backend.md is unaffected (codex-only, no frontend routing).
