challenging

# Challenging — Adversarial Review Adversarial review before shipping. Three paths, each with distinct trade-offs: - **Subagent path** (Claude Code, primary). Native sub-Claude via the Task tool — zero API keys, fresh context window, same model. Best when available. - **External API path** (claude.ai, Codex, headless). Gemini (cross-model + cross-context) or Anthropic API (cross-context). Costs an incremental API call but gives genuine outside perspective. - **Self path** (any environment). The caller assistant inhabits the adversary persona in a dedicated response. Zero cost, retains full subject-matter context from the conversation. Weaker at catching same-session confabulations than fresh-context adversaries, stronger at catching local-convention and factual errors the artifact glosses over. Not a strict downgrade — a different failure-mode profile. The `adversary='auto'` resolution (default) picks gemini → claude → self based on available credentials. Callers in Claude Code still use `prepare()` + Task tool explicitly (subagent is strictly better than self in that environment, and auto-detection of Claude Code is brittle). Inspired by VDD (dollspace.gay) and Grainulation's anti-rationalization patterns. The `drill` helper adopts the 5 Whys pattern from Tim Kellogg's [open-strix writeup](https://timkellogg.me/blog/2026/04/14/forgetting). The self-path persona-inhabitation move is kin to generative-thinking's inversion — commit to the mode before evaluating. ## Profile...