#12 Scaffold cross-AI second-opinion workflows

configs/ai-assistants/antigravity-cli.md

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+# Antigravity CLI Configuration for PrepKit
+
+PrepKit uses Antigravity CLI as an optional coding assistant for independent review and second-opinion workflows.
+
+## Recommended Usage
+
+Use PrepKit's generated second-opinion scripts rather than calling assistants ad hoc:
+
+```bash
+uv run prepkit ai-config setup antigravity-cli
+uv run prepkit ai-config second-opinion
+```
+
+Before asking for a second opinion, update:
+
+```text
+.prepkit/second-opinion/context.md
+```
+
+Include:
+- the current task and constraints
+- files already inspected
+- commands/tests already run
+- ideas already rejected
+
+Treat assistant output as a proposal. Verify recommendations with local tests, benchmarks, or direct code inspection.