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The Phase 8 agent-install E2E checked the pre-unification Antigravity paths (~/.gemini/antigravity/), which broke after the config-path fix. Point the stub setup at ~/.gemini/antigravity-cli/ and assert the MCP server lands in the shared ~/.gemini/config/mcp_config.json with AGENTS.md under ~/.gemini/antigravity-cli/. Verified end-to-end (smoke ALL PASSED).